Question

Find the value of r (5,9) (r,7) m=-4

Answer 1

r = 11/2

Explanation:

m = slope

slope, m = (y2 - y1)/(x2 - x1)

-4 = (7 - 9)/(r - 5)

cross multiply

-4(r - 5) = 7 - 9

clearing brackets

-4r + 20 = -2

-4r = -22

r = 22/4 = 11/2