Answer:
r = 2
Step-by-step explanation:
use slope formula to find r
(r, 3) (5, 9) m = 2
y₂ - y₁ / x₂ - x₁ = m (Formula)
9 - 3 / 5 - r = 2 (use the points given then subtract 9 - 3)
6 / (5 - r) = 2 / 1 [Cross Multiply--2( 5- r ) = 6 x 1 ]
10 - 2r = 6 (solve equation)
-2r = -4
r = 2
