Standard form for linear equations | Algebra I | Khan Academy
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- เผยแพร่เมื่อ 21 เม.ย. 2015
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Standard form for linear equations
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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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i’ve never had a good math teacher in my life, idk where i would be without this channel
You would be in the streets perhaps-
Me remembering I forgot how to do standard form I have a test tomorrow and its 1 am. Thanks
@medium sized mammal, how did you do?
Same :c
Sameee bruh but my teacher is so bad she doesn’t even teach hope you did good on the test wish me luck
@@matthewcarey1685 how was the test?
@@leocarter7035 I have it in 2 weeks
Who else agrees his voice is smooth like butter 😂
Me! I would love him as my real teacher :,)
Like a criminal under cover
casually watching this an hour before an exam :')
osoroshii SAMME!!!
Try five minutes before 😂
did you pass
@@elietayeh2298 I see we are similar
bruh
Sal almost blew my speakers! Lol
Sal, thank you for saving my mathematic mind. I never could have done it without this website. I'm now a math person, I enjoy doing math, and I have placed into a higher class in college thanks to 6 or 7 months of studying with this site. Seriously - this website just may have changed my life. #backtoschool
Nerd
@@brains772 you're the real nerd
@@formlesshydra471 agh im dying :(
Brains srrsly
@@formlesshydra471 tea???
4:43
When you try so hard but you can't succeed ;)
Why am i cryin in the club rn
we cryin in the club frfr
ur in thr club?? **i hope u get the reference lmfao**
Is it just me or this guy writes incredibly good with a mouse?
He writes on a tablet with a stylus pen
I sincerely thank you for the service you provide. I am studying for my teaching license and the math portion of the test seemed like a nightmare until I found your instructional videos . This has truly been a lifesaver for me and I feel much more confident in taking my exam. Thank you and thank you!!
I know this is 4 years later but are you a teacher now?
@@messibecki Hi there! lol...YES! I am a teacher! I teach third grade...in my fourth year. So cool to see this... :)
@@michellestephens2612 how’s teaching!! it’s cool to see that you became a teacher a couple years later :)
I learned a way to identify both intercepts by inspection. Consider your line: 9x + 16y = 72. Divide both sides by 72, then (9/72)x + (16/72)y = 1. Rewriting (1/8)x + (2/9)y = 1. In this form the respective intercepts are the reciprocals of the coefficients of each term; i.e. x-int = 8, and y-int = 9/2. ◼
my son had a 36 in math these videos helped him thanks you so much
Tara Abee I also have a C in math
I don't know if you read these, but the pace and effectiveness of the way you teach has helped me and so many others alot. We deeply thank you
Thank you so much I am in 8th grade taking Algebra 1 and it is difficult this video helped me pass my math test
Ultimate Eagles Oh, simuliar situation, but I'm in 6th grade.
Oh, similar situation but I’m in Year 2
Owen Elmburg
We both know that isn’t true
I'm in pre k and doing AP calculus y'all are late💪💪
Wow guys I was just born yesterday taking trigonometry
Bro thank u man I have a test tomorrow on all forms and converting them and didn’t understand anything the teacher said so I binge watched your vids and now feel ready to ace it
Lolhumor 69 did you pass?
you’re better then any teacher i’ve ever had
My textbook says standard form is Ax + By + C = 0
Mine says y = 4 HOW DO I ANSWER IT
@@justinjamesderayunan7899 i think the answer in ax+by+c=0 form is simply y-4=0 because x is not there therefore you dont need it. also its y-4=0 because i minus both sides by 4
@@Felipe-kv8qd thnx anyway i just put y=4 in my assignment cuz idk and i didnt know someone would reply cuz the video is old hope it didnt take u long to figure that out :3
I thought it was ax+by+c=0
When he speaks about getting the slope what I do is I know that A is the numerator on the slope, and B is the denominator. Then u have to know if the slope is positive or negative. If the equation is written with a plus sign in the middle, the slope is negative, I.e Ax + By. If the equation is written with a negative sign in the middle, I.e, Ax - By, you know it is positive. My maths teacher defaults to Ax - By = A(x coordinate) - B(y coordinate), I think I got that last part right ❤
These videos have saved me on so many test thank you
Not me chillin while watching this(no sleep) 8hrs before deadline lol
Man this video is old but its very nice and it helped a lot at understanding so I can do good at my exam text tomorrow. I really appriciate your work
There is a mistake in the video at minute 2:07, Sal says the coefficients A, B and C must be integers but this is not necessary. You could take for example A=pi
Guillermo Olicón Méndez
Good point!
Thank you so much! I have a math final tomorrow and was confused on this
Thank you, it really helped me a lot
The slope in standard form is really easy it is -A over B
WHY IS THIS ONE SO MUCH LOUDER
u the real mvp
Thx dude my algebra one exam is tomorrow
I love it. Thanks ❤
Thank you:3
would it be the same with subtraction?
The dislikes are from the kids who were assigned this video by there teachers
Sal is a math teacher? 🤔
GIVE US THE INFO!!! SOMETHING WE CAN USE!!!
I wish I had khan academy instead of edgenuity for online schooling :(
Omg same!
Perfect
Thanks for that!
como seria tener clase virtual, mientras la cuarentena
this is the 10th video i've watched and it still doesn't make sense and my teacher is horrible at explaining things failing one test won't be that bad right...????
Sorry for the late reply, but same! My teacher tells us that if he moves to fast to just tell him to slow down. A girl once asked him to and he freaked out and claimed we don't pay attention, when in reality he goes through the lesson at lightning speed and while we are still in question one he's already assigning homework. I end up asking for help and he'll shame me by saying I should have asked during the lesson. It's SO frustrating 😖
@@audiencemission8183 mans replied two years later lol
I love u man keep up the good work
Sal, you already have videos explaining this.
Can you please make videos on solid state chemistry or inverse trigonometry..
Or something like that.
I hope you got my point.
Thank you.
THANK YOU
I have a test tomorrow, this better work.
Edit: IT HELPED ME UNDERSTAND BUT I'LL UPDATE ON THE TEST SCORE-
What happened?
@@Whatyulookinat im in geometry now in the next grade 👍
@@aki_lin__ congrats
@@Whatyulookinat thank you!!
idk if it changes but I live in England and we use y=mx+c, is it different in America? (I assume that's where ur from judging by ur accent)
ZEPO it is. MERICA!!!!!!
B is C, it’s the same, just is represented with a different letter.
Thanks dude!
Thank you
can u guys do an intro to inequalities
What if c=0?
RaNdOM RoYAle if C is 0, then the Y intercept is 0.
Where did the 9 go in the equation 9x+16y=72?
I got lost 2:02. Why does x = a and y = b? Where does the A and B come from?
My head is in pain
Thanks I have a test tomorrow
Hello person rom 4 years ago did u pass?
Hello person rom 4 years ago did u pass?
lost me with the random 0s
Max Safari the “random zeros” are what we assume the X or Y value, when we are trying to find the intercept. Let’s say, we are trying to find Y. Then X is 0. The equation, let’s say, is Y=2x+2. The, constant is +2, so our Y intercept is 2, and our X is 0. (0,2) The point that the line meets the Y value is 0,2
Jaz you saved my life
what do you do when both intercepts are 0
Elizabeth Williams thanks man
Elizabeth Williams i figured it out but at least you still tried
edit: spelling
Can someone explain how he get 72? im confusing
how do i know what c is though DO THEY TELL ME OR WHAT
Ax+by=C is the same thing as ax+by+C=0
Slight correction: "is the same thing as Ax+By-C=0". When you subtract C from right side, you subtract it from left side also. Therefore, it's negative C. If original C is negative, it changes to positive on left side.
I literally must need someone else to do it for me. This is so mind boggling to comprehend and my teacher gets mad when we ask for help. Can someone who is VERY math smart please help me? The stupid textbook is saying Ax+By=C and it's so different from this video.
I have adhd so I have trouble focusing and having a teacher who talks faster than the speed of sound and gets mad when people want help makes it worse.
the only reason i looked up this topic was to figure out how to convert a linear equation to standard form. this honestly did not help at all. normally i look for khanacademy videos becaus ei trust them. not today though.
Could be you found the wrong video for your purposes? Good Luck
Clara Furton they have a video for that
Clara Furton th-cam.com/video/XOIhNVeLfWs/w-d-xo.html
Clara Furton n
All you have to do is to solve for the specified variable b. For example, in y=mx+b, you'll subtract mx on both sides. Then, you'll get mx-y=b which is now in standard form
Not efficient
watch this at 144p
Still can't do this shit
Andrew Espinoza can you explain it, and I can help you with it.
Im confused and cant understand anything im so dumb
You helped my sister but you helped me in nothing why do you go soooo fast I have to keep replaying I am so gonna fail my midterm tomorrow whatever I’ll just go to summer school after I fail regents in 5 months since not you not my teacher can help my dumb self thx for nothing
Did u pass? Or went to summer school?
@RealOtaku. I barely passed I did not go to summer school I just had to retake it since I failed the first time second time I was one point away from failing
i hate math
This video is terrible! Very difficult to see the board.
U is just stupid
U must be blind
Tracy Bowser guys calm down, maybe this person had a low quality for this video. Don’t be rude.