SOLUTION: What equation contains the points (-1,-8) and (-9,-21)

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Question 458664: What equation contains the points (-1,-8) and (-9,-21)
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
slope
m=(-21--8)/(-9--1)
m=-13/-8
m=13/8
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y=mx+b
-9=13/8*-1+b
-9=-13/8+b
-9+13/8=b
-72/8+13/8=B
-59/8=b
b=-7.4
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y=13/8x-7.4