Answer:
r=-5
Step-by-step explanation:
(r--9)/(-2-3)=-4/5
r+9/-5=-4/5
r+9=4
Slope m = -4/5
y₂-y₁/x₂-x₁ = -4/5
-9-r/3-(-2) = -4/5
-9-r/ 3+2 = -4/5
-9-r/ 5 = -4/5
-9-r = -4 *5/5
-9-r = -4
-r = -4 +9
-r = 5
r = -5
