Question

PLEASE HELP!!

Find the value of r so that the line through (2,8) and (r,-4) has a slope of -3

Answer 1

Answer:

r=6

Step-by-step explanation:

$m=\frac{y2-y1}{x2-x1}$

m= -3

(2,8) (r,-4)

$-3=\frac{-4-8}{r-2}$

$-3r+6=-12$

$-3r=-18$

r= 6