SOLUTION: How do I solve (r,-5),(3,13),m=8?

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Question 1169975: How do I solve (r,-5),(3,13),m=8?
Found 2 solutions by josgarithmetic, MathLover1:
Answer by josgarithmetic(39628) About Me  (Show Source):
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

if (r,-5) and (3,13) are two points on same line, and m=8 is a slope
then
s=%28y-y%5B1%5D%29%2F%28x-x%5B1%5D%29
8=%28-5-13%29%2F%28r-3%29
8=%28-18%29%2F%28r-3%29
8%28r-3%29=-18
8r-24=-18
8r=-18%2B24
8r=6
r=6%2F8
r=3%2F4