How do you write an equation in slope intercept form for a line that passes through a certain set of points? And how do you do it if they tell you the x intercept, but not the y intercept? Thanks!

- anonymous

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- anonymous

slope =(y2-y1)/(x2-x1)
slope intercept form =
y=mx+b

- anonymous

Ok, so you use the points in slope formula? But what if you're only given one set of points? Like if it said, slope -5, passes through (-3,-8) ? then how would you do the formula?

- anonymous

use formula, \[y-y_{1}=m(x-_x{1})\]

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## More answers

- anonymous

m=-5
y1=-8
x1=-3

- anonymous

ok

- anonymous

If I deserve medal then give me one

- anonymous

u need help with equation?

- anonymous

hold on one sec

- anonymous

Thanks! ok how do I give you a medal haha?

- anonymous

next my name click on good answer

- anonymous

Oh wait, what if it's perpendicular?

- anonymous

2 line intersect have angle 90 degree

- anonymous

paralell never intersect

- anonymous

Right, I know, so how would you put that in slope intercet equation?

- anonymous

slope -5, passes through (-3,-8) ?

- anonymous

No, if it says that it's perendicular to lik efor examle, y=3x-2

- anonymous

let do this ffrist
y-(-8)=-5(x-(-3))
y+8= -5(x+3)
y= -5x-15-8
y= -5x -23

- anonymous

Yes, I got that

- anonymous

u want write anothe equation is perendicular to this line y=3x-2?

- anonymous

yes, and passes through (6,-1)

- anonymous

perendicular slope is flip and opposite side
Example :
slope = -1/3 than
y-(-1)=-1/3(x-6)
\[y+1=\frac{-1}{3}( X)+2\]\[y=\frac{11x}{3}+2-1 \]\[y=\frac{-1x}{3}+1\]
\[y=\frac{1x}{3}+1 \]perendicular to line
y=3x-2
u can check by : produc of 2 slope is -1 then they are perendicular

- anonymous

Thanks!

- anonymous

\[\frac{-1}{3}\times3=-1\]
-1 yes they are perendicular

- anonymous

good cluck your home work

- anonymous

Thank you

- anonymous

u forgot give me a medal

- anonymous

How do I do that again?

- anonymous

next my name click on good answer

- anonymous

d u see?

- anonymous

next may name right hand side

- anonymous

It won't let me click on the medal symbolk though

- anonymous

u see medal or good answer?

- anonymous

click on give medal or good answer

- anonymous

There is nothing that says that

- anonymous

not thing next to my name? some one just give me

- anonymous

never mind

- anonymous

There is a medal symbol and it says 117, and then a shield and it says 10. I can't click on either of those. There is nothing else.

- anonymous

next it says 10

- anonymous

after it says 10

- anonymous

this u see the box say good answe or give medal?

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