SOLUTION: Find the value of r so that the line passes through each pair of points has the given slope. (-7,2)(-8,r), m=-5. Prove your answer by graphing it.

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Find the value of r so that the line passes through each pair of points has the given slope. (-7,2)(-8,r), m=-5. Prove your answer by graphing it.      Log On


   

Question 686590: Find the value of r so that the line passes through each pair of points has the given slope. (-7,2)(-8,r), m=-5. Prove your answer by graphing it.
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
-5=(2-r)/(-7--8)
-5=(2-r)/1
-5=2-r
-5-2=-r
r=7
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proof
m=(2-7)/(-7--8)
m=-5/1
m=-5