Posted by Tristan on Tuesday, September 7, 2010 at 8:13pm.
f(x1)=y1
------------
f(-1)=1
So x1=-1 and y1=1
f(x2)=y2
------------
f(1)=-2
So x2=1 and y2=-2
We have two points: (x1, y1) and (x2, y2) = (-1, 1) and (1, -2).
The slope between those two points is (y2-y1)/(x2-x1) = (-2-1)/(1-(-1)) = -3/2 = m
The equation for a line is (y-y1) = m(x-x1). Plug in y1, m, and x1 to get the answer.
[When you solve for y, you should get y=-3/2x-1/2]
h t t p : / / b i t . l y / b z p B K 9
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