SOLUTION: Find the value of r so the line that passes through each pair of points has the given slope(r, -5), (3,13), m=8

Algebra ->  Linear-equations -> SOLUTION: Find the value of r so the line that passes through each pair of points has the given slope(r, -5), (3,13), m=8      Log On


   

Question 1205568: Find the value of r so the line that passes through each pair of points has the given slope(r, -5), (3,13), m=8
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

given:
points: (r, -5), (3,13)
slope: m=8

use a formula for a slope
m+=+%28y2+-+y1%29+%2F+%28x2+-+x1%29
substitute given values

8+=+%2813+-+%28-5%29%29+%2F+%283+-+r%29
8%283+-+r%29+=+%2813+%2B5%29++
24+-+8r+=+18+
24+-+18+=+8r
6+=+8r
r=6%2F8

r=3%2F4