Two-variable linear equations and their graphs | Algebra I | Khan Academy
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Introduction to 2-variable linear equations and their graphs
Algebra I on Khan Academy: Algebra is the language through which we describe patterns. Think of it as a shorthand, of sorts. As opposed to having to do something over and over again, algebra gives you a simple way to express that repetitive process. It's also seen as a "gatekeeper" subject. Once you achieve an understanding of algebra, the higher-level math subjects become accessible to you. Without it, it's impossible to move forward. It's used by people with lots of different jobs, like carpentry, engineering, and fashion design. In these tutorials, we'll cover a lot of ground. Some of the topics include linear equations, linear inequalities, linear functions, systems of equations, factoring expressions, quadratic expressions, exponents, functions, and ratios.
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My teacher explained this in class and I literally was lost but this video saved me. Thank you Sal Khan you are a miracle to this madness
am I the only one who wonders how he writes perfectly with his mouse
i was wondering that to it probably a smart pad though that has a pen probably the reason why its so neat
He probably has a drawing tablet he just uses it for teaching instead lmao
There is a thing known as specktron check it out
he is using drawing/wacom tablet
He turned up the stability
Time goes so fast when you're trying to figure out how to do your homework😭
How do you know 😭😭
I feel that
ONG IT DOES 😂
Thats what math is
Ikr
Thank you Sal. My teacher explained this in 3 hours and I didn't get it, but you explained in less that 9 minutes and I got the whole idea. You're the best
+Mo bahjat i agree, i don't know why i don't understand a single thing to my prof said when she's discussing, but i do understand them when i watched how it works in youtube
+Silent Walker some teachers don't make sense at all
Mo Bahjat true
my teacher talks way to fast doesnt do it more then once so im stuck in summer school cause she doesnt know how to teach i watch this and it make like 200 times more scene then my teacher just said thats just sad
You have a very nice voice, and your instructions are clear! You sound like the smartass brother I never had.
Thanks so much for this i literally didn't understand my teacher you are a livesaver 👍👍
His voice is making this fun to learn
Not gonna lie this section of algebra and geometry is like, super fun to learn and is interesting
@Stellar Not true, it hurts :/ lol
You can have it. Its torture to me.
Oop
18,000 people and no one has said "first" yet. Wow.
Lol
+hiplegend214 scroll down too the first comment.
first!
that's so 3 years ago
69th like.
Who’s here because of finals
Mid terms
Nico my channel same
Have a test on this today along with my premed test
came here for the reports (grade 8)
Im here because of mid terms
Why does This sound like magic to me
It is indeed magus dear
This guy always teaches us step by step thanks man
3 minutes in and I've learned more in my whole chapter dedicated to this. wow. amazing teaching, thank you Khan Academy.
IKR
omg i need to stop i have a test
I love Khan academy other educational apps or channels are waste
You are the main Khan today!!
my teacher just told my class to watch this video and i'm glad she said that cuz now everything makes so much sense thank you:D
Thanks a lot, I was really struggling with my homework!
You deserve a like!
yeah sal is the best
For the first equation, it looks like the slope would be 2/1. Does this mean that at each point on the pink line, we should count up 2 and over 1?
yeah, rise over run
Yes he is a professional when I was at school I didn't understand this concept thanks man you are a great teacher I am subscribing you 😊😊😊
Am i the only who thinks he has an amazing voice ?
Thanks for this video
Am i the only one who found his voice soundlike corpse husband's in 2017? Okay I'm gonna focus now on the lesson
me too it sounds like corpse lol
I think,i can carry on with my studies now,Thanks DUDE 👍👍👍
thankz man!!!! i got it
thank you so muchhhhh I couldn't understand our handouts and i'm already several modules behind. if i just saw this sooner haist. THANK YOU SO MUCHHHHHHHHHHHHHHHHH
Thanks
You help me with cyber math 90
Thank you very much
Thank you!
Does anybody think there ADD/ADHD affected their attention? Because everytime I was thought something (atleast algebraic), i went to space quicker then the flash.
it does
Bruh ADD stands for attention deficit disorder.
Agreed I don’t know if I have adhd though
this was so helpful, I forgot how to solve ax-by=c, but you saved me, I tried treating it like a quadratic and factorising but it wouldn't work, it didn't fit into y=mx+c so my head started overheating lol
Help alot thank
Why do the solution of a linear equation in two variable lie in the same line?
Ayaan Ahmed do you mean why its point of intersection?
i think that’s why they are called “ linear “ equations but i still don’t know the reason
I've studied straight lines n now I think, this has to do with slope
and y=mx+b
okay I had no idea what these lessons mean when I was reading it but now I did because of this guy thank you
I understood this perfectly in just the first example
2x2 is 4-1=3 khan math
...am I the only one on the floor dying? K.
2x2 is 4 - 1 is 3 khan maths :D
This video really helped me thank you!
Thank you Mr. Khan! You are the best!!!👌👏😃
1:29 BIG SHAQ QUICK MAFS
Adrian del Campo *MATH INTENSIFIES*
Are you a true Asian.
Adrian del Campo hahahah
boi
very helpful, thank you !
9 standard is hard...and
It's the best explanation video I've ever seen
After 14 days my exams are coming n this guy is making my days easier
Thank you
Love from india
._.
You’re a life saver my guy
i was learning this in school and this is so easy now, thanks khan academy!!!
I have a question, when do we actually apply this ?
in that test
yea
ha ha ha these MAY come in handy in the future, probably not but they MAY thats why they torture us with these assignments
Very helpful
which software is he using
At 5:00, what if they can’t be divided?
thank you
I understood it now
Hey where did x come from pls. Answer ASAP
April Joy Quisto i think you can choose any number for x
x is a variable, so it is unknown.
@@joshthio00 When you answer to him 6 months ago 😂
How do you know that’s a negative 3 and not minus 3? And what would be in between 4x and 3y if it were a positive number?
Awesome! I'm now 3 grade levels past what I'm learning!
NERD
In my auto play:
It's a twentyonepilots crack video
what is my life
thanks a lot!!!!!!!!!!!!!!!!!!!!
Aaah. I keep finding myself back here at this channel. Love it
wish you wrote the word down but thanks its good
how did x be equal to one?? in 1:13 ?? please answer me I'm confused..
If x is equal to 1 multiply by 2, then sub to -3 equals to -1
x y
(1 -1)
Why is it 1? he puts 0 first, so 1 and 2, so on and it will make a line.
We're assuming x is 1
Where did -1/2 came from?
Can X and Y be Blank? Or you need to put your own number?
But what if y doesn’t equal a whole number, like it equals 4.5 or something
You can still graph it. But if it doesn't intersect the line, then the solution is wrong
I still dont get how u did the 4x - 3y = 12
@neris dwlrma last week, the day i commented that, was midnighr and i didnt sleep at all just to study for the finals/exam/qa but in the end, i was at a mental block. I probably failed the test sighhh
4x minus 3y equals.to 12
WE only need to find.the value.of y
so like if the value of x is 0, 4(0) minus 3 y equals to 12
0-3y=12 so what is the value.of y that.satisfy that?
-4 can.satisfy that. equation.because we.need it to.be.the value.of.12 so -3(-4)=12 so its gonna be 12=12
@@adonisadamn1 This makes no sense.
am i the only who thinks you sound like Joe from Family Guy
yes
Pretty much
Sounds nothing like him
random question, what microphone do you use?
I was confused in a lesson with dots and simple equations and till now I'm still confused
Sir, can we prove that it is linear, or do we hypothesize it is linear? We can't verify every dot, can we?
07:17
How about y>x+2.?
I had a problem with how in heck the equation transferred to a graph coz my teacher didn't explain well enough that I should just randomize "x" and use IT on the actual equation to get "y" on the table . I was instead using substitution and elimination methods whilst never getting my answer
so since the lines intercept it would be no solution?
it only took 1 minute and 48 seconds to understand
same😂😂
Can someone help becaus ein my book it says the instruction is graph the linear equations in two variables waht will i do will i make a graph or i will sove it?
how do you do pair of equations like this 3x+y=5 and 2x+y=9??
Pokemon TV TV those equations aren’t linear equations, they are called standard equations. Watch one of their videos to see how to transform one to a Slope.
Let me show you what it looks like
Standard form is
ax+by=c
Slope form is
y=mx+b
vary simple
though may we have variables raised to a negative power? for an instance 3^-8?
How come the guy on TH-cam explain this better than my textbook ._.
he sounds like ranboo wtff 😭😭💜💜
1:30 how did x become 2, the explanation is so confusing, it doesn't say how the number turned into that or anything 🤦♂️
Bcuz he's thinking to any number that if you subtract to 3 the answer is 1 so if you think 2×2 is equal to 4 and if u minus it to 3 the answer will be 1 which is the y
@@dianaaurin5655 thanks it helped me out
I need tp know how he got numbers for x and y,pls help
Thank you Mr. Khan! I got it...
this is for grade 9 and my teacher is milking the last 2 weeks of school to learn this,
useless information that i will forget after summer break
Wait this is for 9th?- then why am I doing this for 8th? 🧍♀️
@@-_K.-_ This video is also for 8th graders.
thank you so much! you really helped me understand thank you.
aaaaaa thankyousmmm
how do you make a salary scheme with this method?
How do you do equations like y=3 and x=4
Thaks shering vedeo
POV you're stressed out and you search for sumthin because fck
I wish i watched this before the test
nice and have a nice day
Sir geometrically soon of linear eqn with one variable is a point then why we call it linear eqn
From where are you getting random numbers man, i got so confused when u were having x and y in two sections
but how do you do equations that look like 2x+8y=-64
solve the equation and the final answer will be 8y= 64-2x
don't forget to simplify it. 4y=32-1x -> y= (32-1x)/4
i registered late for a class and started in the middle of a unit im complety lost I hope this helps
How did the second graph 3,0 happen???
Can you raise your voice just a little bit please
*khan academy* 🕳👨🏻🦽
What if I get -10, -5, 0, 5, 10? How do I graph that?
photomath
Kaya ayoko sa math eh
My teacher asked us to watch this not knowing that I can't understand math clearly
101th!!!!!
I still don’t get it bro I need help
why on the computer .
we are gonna generate a _Line_
first
i know im 5 years late i just wanna see ppls reactions so dont read this until youve read the replies