Question

Can someone please explain "standard form" for me? I never learned it even though I was supposed to-
my teacher told me: Ax+By=C. What does it solve? What am I supposed to do with it? Explain anything you can please
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Answer 1

It's another way of writing the equation of a line. It's not particularly useful, but if your teacher tells you to write the equation of a line in standard form, just rearrange terms until you get it in standard form.

Answer 2

Can you show me an example? (step by step)

*It's you again! xD haha*

Answer 3

So, an example: y=2x+3. Subtracting 2x gives you y-2x=3. That is in the form of Ax+By=C.

Answer 4

Can be written as -2x+y=3. Same thing.

Answer 5

Soo it's just like y=mx+b (a way to write a linear equation). Is there a way I can graph through standard form? Is there a certain use to it?

Answer 6

Actually, no. I was wrong. Supposedly the coefficient of the x-term must be positive. SO in my last example, make x positive by multiplying each term by (-1). Thus, (-1)(-2x) is now 2x, (-1)(y) is now -y, and (-1)(3) is -3. So, together: 2x-y=-3 is the right answer.

Answer 7

Why does the x have to be positive?

Answer 8

No, no way to use it. It's stupid. Just turn equations into that when necessary. I have no idea. Just know how to get that form, and do it if the teacher asks you to.

Answer 9

So the x always has to be positive, the others don't matter?

Answer 10

Also, my teacher said that A, B and C always have to be integers (whole numbers)? What's the deal with that?

Answer 11

Yeah. Also, fractions are not allowed in this form. If you hae a fraction, just multiply each term by the reciprocal. That's what integers are- whole numbers (any number that's not a fraction). So if there's (1/2)(x), multiply everything by 2 (the reciprocal of 1/2). This makes x be (1)(x), and 1 is a whole number.

Answer 12

An example: http://www.algebra-class.com/image-files/standard-form2.gif.

Answer 13

So the x always has to be positive, the others don't matter?

Answer 14

Whoops. http://www.algebra-class.com/image-files/standard-form2.gif

Answer 15

Sorry didn't mean to type that.

Answer 16

Okay so basically all I have to know is: reorder it to Ax+By=C, NO fractions, and x must be positive? And that this has no use?

Answer 17

Other than to make the equation look pretty? No. And yes, that's all you have to know.

Answer 18

Here's more info: http://www.mathwarehouse.com/algebra/linear_equation/standard-form-equation-of-a-line.php

Answer 19

They say it's useful when graphing, but slope-intercept works just as well, in my opinion.

Answer 20

How is it useful when graphing?

Answer 21

Okay so basically all I have to know is: reorder it to Ax+By=C, NO fractions, and x must be positive? And that this has no use?

Answer 22

It isn't. Use slope-intercept form almost every time (except when it's necessary to use point-slope form).

Answer 23

Ugh sorry my computer does that.

Answer 24

Thanks(: http://openstudy.com/study#/updates/522d0e12e4b0fbf34d633970

Answer 25

Can you see if I answered that right?