Solving linear systems by substitution | Algebra Basics | Khan Academy
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Solving Linear Systems by Substitution. Created by Sal Khan.
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Algebra basics on Khan Academy: Topics covered in a traditional college level introductory macroeconomics course
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Пікірлер: 663
this short video explained more than 45 minutes of rushed class time , thank you khan~
@cat_jk00
8 жыл бұрын
Yeah, the problem with a lot of math teachers is the fact that they have been good at math for their entire life, and they can't see that some people aren't. Great teachers had to work to become great, and other's didn't.
@pookiesamurai7500
8 жыл бұрын
Exactly.
@nooneliveshere9303
5 жыл бұрын
Thank you khanye very cool
@tati.5664
5 жыл бұрын
right!
@abendeavours4200
5 жыл бұрын
Sal*
This was easy than I thought. I only learned for 5 mins by watching this video, while 3 hours of our teacher teaching us math while rapping very fast
@mikinzycote9386
4 жыл бұрын
😂
@v3rycherrybomb
3 жыл бұрын
Lmao yesssss
@rehmanahmed7466
3 жыл бұрын
Trueee
@jerson4365
3 жыл бұрын
fr
Khan academy is literally the only way I understand math.
@Grayman2003
7 жыл бұрын
MC Miller Same. Lol
@Unluckyleon
7 жыл бұрын
MC Miller I'm have a. Test tomorrow and I'm doing last moment khan academy revision XD
@dv4346
7 жыл бұрын
Lol I don't get it styll
@suavefrog5029
6 жыл бұрын
They teach me better than most of my math teachers 😄
@mepe705
6 жыл бұрын
Mc miller same I’m literally watching this before I need to go to school and I have a test
I despise online school, I suffer from adhd and I can barely concentrate in my home environment compared to my school environment. My grades went from As and Bs to Cs and Ds and i almost failed 1 course not to mention that I am now 5% from failing math. This man is helping a lot during pandemic. Even if some of his videos were made over 10 years ago.
@tyywtf
2 жыл бұрын
same dawg
@Uniquesoup
2 жыл бұрын
same
@ndmr7095
2 жыл бұрын
same
@Nobody64928
2 жыл бұрын
omg! cant say it better myself 5/5
@Creative_mr_gold
Жыл бұрын
Skill issue
This is so unbelievably helpful 😭 I'm crying because his 2 in the morning and I've been stuck in this homework for the past hour and it took me only 2 minutes to understand with him.
@blxzing1201
7 жыл бұрын
Omg same
@mxlky9187
7 жыл бұрын
Me right now
@andrewgarcia188
5 жыл бұрын
sadly yes not knowing what to do no progress more than three hours with it being after midnight made me depressed and I broke luckily this guy can teach
@yemixakin
4 жыл бұрын
Ogeyand
this makes so much sense now. why can't my math teacher do this
@nytrowgen2889
8 жыл бұрын
+michelle elliott mine too
@JeffnasticsPvP
8 жыл бұрын
+michelle elliott SAME
@Hello-cs2bv
8 жыл бұрын
+michelle elliott It's like the teachers know this, but they suck at teaching and because of that, they have to help other students and the teacher doesn't have time to help you.
@jimkeller3868
8 жыл бұрын
+michelle elliott I think most teachers DO teach it exactly this way, and this clearly. There are 3 things I believe most people don't consider when thinking this is somehow a clearer explanation: 1) you're in a completely different setting. At home, relaxed, later in the day so perhaps more awake. 2) You can stop the video and replay it or you can stop it and think about it. You can't stop the flow of time in your classroom. In this respect, there is less pressure. 3) you are learning alone. There is no peer pressure, the feeling of embarrassment if I ask a dumb question. There are less distractions and concerns about other students or your teacher. The above content is not four-dimensional tensor calculus. It is straight forward and fairly easy to teach.
@Cluetube
8 жыл бұрын
+Jim Keller i actually kinda agree with Jim. but at the same time i kinda dont. but since i cant really put my reasons why i cant into word form. ill just leave it at JIMS RIGHT.
10 years later and I'm relying on this channel for basic algebra.
@wacky4159
2 жыл бұрын
same
@dark_fury1595
Жыл бұрын
me too
the traditional school system is soo old and makes things so hard, and the teachers only explain once and expect us to know everything, but every student has different needs
@Mar-om6ct
3 жыл бұрын
@Anime Watcher 🖥 🍿 replying after two years 😂
@Mar-om6ct
3 жыл бұрын
@Anime Watcher 🖥 🍿 replying just after I wake up 😂
@AshmewStudios
3 жыл бұрын
@@Mar-om6ct nice
@Mar-om6ct
3 жыл бұрын
@@AshmewStudios early reply
@AshmewStudios
3 жыл бұрын
@@Mar-om6ct good job
Without khan academy I would be failing algebra
@lpsdarlingdevil2535
6 жыл бұрын
Derrick Hess like me
@bigsmoke6086
5 жыл бұрын
I’m surprised I’m not failing
@katzy9218
4 жыл бұрын
Same!!
@latonyagriffin5811
4 жыл бұрын
I already am
@emmasmith971
3 жыл бұрын
I’m 2 or 3 points away from failing 😂
time:1 hour to algebra test teacher:you guys have 1 hour to finalize your studying me : i need 9:20 minutes only
Soooooo khan for president or what? I never have wanted to thank someone more, Thank you!
i hope this guy goes straight to heaven. he helped me through middle school school and still helping me in high school. thank you khan
I've been struggling in my math class for many days trying to understand and this helped me understand it so quickly. Thank you!! 😭
@minimage1055
2 жыл бұрын
Are you in 9th grade?
@KNGallen
2 жыл бұрын
@@minimage1055 grade 10 academic 😭
@minimage1055
2 жыл бұрын
@@KNGallen I’m going to grade ten next year, how is it? Ac math
@KNGallen
2 жыл бұрын
@@minimage1055 it’s definitely challenging but I’m finding it so far much easier than grade 9. Might just be my teacher who made it so hard in grade 9 but if you stay on top of homework you should be fine.
@minimage1055
2 жыл бұрын
@@KNGallen thank you so much, I’m really good in school I just have so much anxiety haha
Thank you so much. This video has saved my life!!! I was absent from school today and our homework was on this topic. When I tried do do it I was lost. Thanks to this video I now understand it. Way easier than I thought!!!! Thanks again, Khan Academy!!!!😀
@nebulai9587
4 жыл бұрын
You're welcome. Even 5 years ago
@Ryan-sm5sw
2 жыл бұрын
Hows the adult life bro
@smajerboy25
2 жыл бұрын
@@Ryan-sm5sw maybe not so good o.o
Learned more in a minute of watching than 50 minutes of pre algebra tbh
@tati.5664
5 жыл бұрын
same!
Thank you Khan Academy for helping me not fail algebra. 👍👍👍.
khan academy helped me with my understanding of math, the way my teachers explains things confuses me meanwhile, khan academy actually explains and goes directly to the point, please donate to them so they can help students like me understand and learn math
I don't know if the people from khan academy know that they are actual gods that have saved so many of us. From the bottom of my heart, thank you.
This video is pure gold.
@briankim49
10 жыл бұрын
This is better than gold!
@HBoywasdocile
5 жыл бұрын
Brian Kim better
I still dont get and I have a test and monday.I hate math
@GrubworldLinearMusicChannel
8 жыл бұрын
+Mariam Mozham Khan Academy is making me solve it easier than my math teacher..
@chrisandboyz77
6 жыл бұрын
Mariam Mozham me too
@ryll5277
6 жыл бұрын
they problemly got you confused by them subracting by 2y on both sides, but relly its easier to solve by subtracting x on both sides then get y alone by dividing the 2 by -x+9
@deletedchannel2659
5 жыл бұрын
Mariam Mozham me too... i still don’t get it
@jayfml2243
4 жыл бұрын
what'd you get on the test on monday?
Thank you so much. In fifth grade my teacher was teaching my class 7th grade math and I would have failed if not for you. So far in eighth grade these videos are helping as well!
I got a 91 in my Math Exam with he help of this video, thank you!
I was struggling so hard on this in class, but 2 minutes into the video and i already understand. THANK YOU!!!!
@Lizzygaming101
3 жыл бұрын
Can you help me with an equation and explain to me how it works bc I'm still confused bc either way if you put the x or y on the side of the equation by itself it still has a number in front of it and I don't understand
That's one great explanation. No steps were missed and each step was explained. Some teachers skip explaining certain steps assuming that the student already knows about it but they don't.
I have a review packet in 8th grade for things from 7th grade, but some are new that we’ve never done before, and some are too complicated to remember over summer, so this is a lifesaver
it's 2 in the morning and I'm studying last minute for a test I have first period...
@ethanatorism
7 жыл бұрын
Join the club
@dbell1911
7 жыл бұрын
Beatriz Valdes yep mines second period tomorrow :((
@allit2190
6 жыл бұрын
Beatriz Valdes me to
@Evelyn-rg2nx
6 жыл бұрын
same
@landendrake1696
5 жыл бұрын
Same.. except i'm doing it a year later lol.
this man I found on the internet taught more than my actual math teacher...
my brain is slowley entering an endless paradox of confusion and pain
@zainab2737
3 жыл бұрын
Felt😭
HOW TF IS THIS GONNA HELP ME IN LIFE
@seb7202
6 жыл бұрын
Math is the language through which you understand physics, and physics is the study of how this physical world moves and behaves. By extension, since physics shows how objects in motion behave, it also has many applications in every other kind of science. So if you want to work in a stem field, be a doctor, a vet, and hell a sniper for the military, you need a solid math background. There are also many other jobs in finance and business that require basic to advanced mathematics. Not only that but our everyday lives are heavily impacted by discoveries in stem, technology is typically the lens through which we see the world (for example engineering and technology which is heavily math based influences how well doctors can see your cells ie microscopes thus mathematics has saved your life by allowing advancements in the medical field with this new knowledge of cells). So really how has it not already helped you? tl,dr unless you want it to, it won’t.
@matthewwurster1133
5 жыл бұрын
Nice explanation
@luidnathan5311
5 жыл бұрын
@@seb7202 Good one.
@abdalrhmansalman7225
4 жыл бұрын
It wont :) This is the schooling system
@manicpixie8672
4 жыл бұрын
We'll say life has ten apples ......
My teacher Mr.Richards recommended me here, because I had a F, but he knew I was trying. This helped mate! (There is multiple Richard's in the world so I didn't censor it)
I have my state exams tomorrow, and I have to pass in order to receive a high school diploma. I'm quite nervous, so I'm reviewing. Thanks for this video!
@maverick885
4 жыл бұрын
Did you pass?
@iceaspect7591
4 жыл бұрын
@@maverick885 bro i was wondering the same
@manicpixie8672
4 жыл бұрын
Did you
@ilikepizza2020
4 жыл бұрын
Evelyn McNaughton yes, I did pass! I’m graduating this year!
@ilikepizza2020
4 жыл бұрын
Ya boy Mav yes, I did. Sorry for the late reply.
omll thank you so much im currently in the process of doing homework over winter break (long story) and since the teacher isnt here this helped so much thank youuu :DD
bruh he sounds so excited his energy really makes me want to learn
Great explanation! I'm glad I was able to find this video.
Life saver, my teacher can't barely explain clearly, your awesome
dude!! thank you!!! i spent an hour staring at my book and going through useless vids, but yours is dope!! you earn my subscription!!! i hope you find money on the street as you walk.
you’ve thought me more my 8th grade math year then my actual teacher ever could have
Sal's a bad ass wizard man who conjures the simplest thing ever out of thin air. Magic.
I still don’t understand I’m really that dumb huh...
Thanks, my math teacher taught us a method that made absolutely no sense at all; this helped a lot- thanks this saved me.
Sir you forgot to add negative on y=-7 3:29
@MrWarthog
4 жыл бұрын
no he didn’t it’s supposed to be like that
the "sum of 2 numbers is 70, and they differ by 11" problem can simply be solved by a single equation with a single variable like this: x+x+11=70 2x+11=70, subtract 11 from both sides, -11=-11 2x=59 x=29.5 the smaller number is 29.5, the larger one is 29.5 +11= 40.5. Done. Not saying you video is bad, or anything, on the contrary, khan academy is really good, and you explain these things really good as well. Just saying that you could have used an equation that didn't already have a specific way of solving.
how are you so smart im an idiot at this
Love your videos . You explain it so much Better . God bless you . 🙂🙏
Very useful, and displayed. Wish you were my math instructor. Well you are, shall we say. Thanks again
honest to god just studied for my math provincial just from watching these videos, learned way more than a full semester of math class
khan academy is the hero we need during quarantine, but not the hero we deserve
THANKS KHAN ACADEMY .BEST MATH TEACHER
@gointosleep Mr Khan : uses his head Teachers : Uses teacher book
LETSSSSSSSSSSSSSSSS GOOOOOO I LEARN MORE FROM 4 MINUTES OF THIS THEN I EVER HAVE IN SCHOOL!!!!!!!!!!!!!!!!!!!!
Thank you for explaining this 🙏
Khan Academy My teacher sucks she is so bad doesn't even care/help this helps she rushes in the 50 mins of. Class I hope this helps me for my quiz tomorrow on this Thanks KHAN
@heylosersaykidbackwards9021
7 жыл бұрын
my teacher doesn't suck but shes AWEFUL at teaching students. she talks way to fast and writes really fast and at the same time you also have to be ready to answer any questions that she throws at you in the middle of the class during the notes. HIGH SCHOOL IS TOUGH :(
@TacoMastersAssociation
7 жыл бұрын
I have to retake a quiz now because I was absolutely stumped. I wish I discovered this earlier on, though. High School sucks.
Thank you so much. At first I was having trouble in my class, but this video cleared it up excellently! Thanks again!
Literally, my math class is like an hour and 25 min, and I did not get what the teacher was saying, thank you sooooo much that now I know how to use this method!!
ALLAhuAkbar BISSSMALAHAH, Sal Khan, may ALLAh bless you, habibi
love how this is taught
Oh my god I actually get it now! I’ve been trying for like a week but EnVision math isn’t any good. Thank you, Sal Khan
this really helped me alot in algebra. Khan is a genius.
Much much clearer than how all the others i have seen on youtube teach about it
His voice is so understandable
at last, i found some kinda math that im talking about..... thanks khan, it helped me a lot.... all the other videos were just an easy exapmle of how to do linear.......(bla bla bla) but this one actually helped me
This video makes this concept so much easier to understand. I am amazed :)
you're a better teacher than my math teacher in school xD at least you could explain how these things are done unlike my teacher
@Rampage_Arrow
Жыл бұрын
11 years ago hows life
Khan Academy in 10 minutes > 11 hours of class time
Khan Academy: thoroughly explains everything and WHY you do it. My math teacher: Don't do this, it won't work.
10 years later and this guy is still the reason im passing algebra
how do you know when you can multiply by -1 to make the 7 positive, would -7 be wrong?
@ayelelleososole4588
2 жыл бұрын
Kind of, the y can’t be negative. That’s why you multiply it by -1.
and whoa, this just helped me understand it all instantly when it comes to the substitution method. Thanks from Sweden =)
i have been struggling with the subsitution method and now i understand it . THANKS KHAN
Thank you very much really appreciate your great and unique work
Oh thank god I found this, I have a test tomorrow and I was full on panicking but now I understand how it works!!
Sal Khan is a good man. Thank God for Khan Academy.
Omg thank you sooooo much I didnt understand when my teacher was teaching and then I watched this video and I still didn't understand till I watched it again step by step and now I got it so thank you so such
That's amazing, creating numbers from just thin air (almost). I found Thai very helpful especially since I'm studying for sats
Thank you. I was stuck on a problem for a solid 25 minutes this helped me solve it
i love how my teacher explains this for weeks and i dont get it, then i watch this and understand perfectly
@Rampage_Arrow
Жыл бұрын
10 years ago man how is life
I learned from this video (,: Finally, KZread has a purpose!
Khan Academy is God's sent angel.
@jayfml2243
4 жыл бұрын
Philip Birgenheir is our God. Join our community and subscribe to him
God damn, never have I understood something so clear
you're breaking my brain!! thanks.
So why is my teacher getting paid to unsuccessfully explain this to me within a 47-minute time-frame? But you can completely make me understand this for free in a little over 9 minutes?
Watched this mid test while on Zoom. Thanks so much
During the pandemic we have half of our classes online and the 2 days I had in class to ask for help in math we’re cancelled and the test is Monday, thanks for these vids
can u be my math teacher?
@brendanb1929
8 жыл бұрын
+Insanity Chan Ikr
@shinigami-scythe5874
8 жыл бұрын
+Insanity Chan for real haha
This really helped thanks
this is amazing I learned this in under 5 min rather then my tutor in a hour thanks^^^
Thanks, you explained a 1-hour long math lesson in less than 10 minutes.
Khan Academy is goated
This guy teach very well and easy to understand
Thank you.
thanks so much hate algebra 1 lol
@brendanb1929
8 жыл бұрын
+sesnn francois same
BRO YOU SAVED MY LIFE, THANK YOU SO MUCH, you explained this better in 10 minutes than my teacher could in 2 weeks
Thanks a lot hope this video get more likes
Wish my instructor made it this easy. Thank you.
But I just have a question shouldn't be at least divide 2y since it is multiplying not subtract it casue next to it is y and btw it is for the first test question
@esraaabdulrazzaq9678
4 жыл бұрын
First question in the vid not test}
This was actually really helpful. Better than all the other videos I've tried. I understand perfectly.
Thank you!
khan academy is the reason i have an a in math, thank u so much man
Thank you so much ! I thought I’ll never understand how to do this
This literally helped so much and saved so much more of my time so thank you