SOLUTION: how do you put the two ponits (5,-5) (0,8) into slope intersept form

Algebra ->  Graphs -> SOLUTION: how do you put the two ponits (5,-5) (0,8) into slope intersept form      Log On


   

Question 379389: how do you put the two ponits (5,-5) (0,8) into slope intersept form
Answer by sophxmai(62) About Me  (Show Source):
You can put this solution on YOUR website!
The points that are given to you are (5,-5) and (0,8).
The equation is y=mx+b.
What you need to find is the slope, m and the y-intercept, b.

To find the slope, m, you use the formula:
m=%28y2-y1%29%2F%28x2-x1%29
So, m=%28y2-y1%29%2F%28x2-x1%29
m=%288-%28-5%29%29%2F%280-5%29%29
m=%2813%29%2F%28-5%29

Now from y=mx+b, we have y=%28-13%2F5%29x%2Bb
To find the y-intercept, we can substitute one of the points in for x and y, and solve for b.

(0,8)
y=%28-3%2F5%29x%2Bb
%288%29=%28-13%2F5%29%280%29%2Bb
8=0%2Bb
8=b

Now from y=mx+b, we have y=%28-13%2F5%29x%2B8