Simple Question (1 Viewer)

[-billiris]

General Form:

Ax+By+C=0

I know you can quickly find the gradient by going -a/b

How do you find the y-intercept? I think it was c/a but i could be wrong.

Thx my textbook only has gradient.

 

[rand_althor]

The y-intercept is when x=0.
A(0)+By+C=0
By=-C
y=-C/B

 

[Flop21]

You can find the y-intercept by looking at the +C if it's in y=mx+c. But honestly that's not really a great way to find it, or reliable. I would do what rand_althor said and just make x=0 so you can solve the equation to find y=whatever. Same for the x-intercept, make y=0 so you end up with x=whatever.

 

[InteGrand]

You can find the y-intercept by looking at the +C if it's in y=mx+c. But honestly that's not really a great way to find it, or reliable.

It actually is a great way to find the y-intercept if the equation is given in that form. It's not called the slope-intercept form for nothing! (m tells us the slope and c tells us the y-intercept, so no need to waste time finding those if we can read them straight off the equation.)