Respuesta :

3167972

Answer:

A. 10

Brainliest, please!

Step-by-step explanation:

(1, 2)(x, 5) = 1/3

5 - 2 / x - 1 = 1/3

3 / x - 1 = 1/3

x - 1 = 3 / 1/3

x - 1 = 9

x = 9 + 1

x = 10
Perpendicular lines have gradients that multiply to make -1. In this case 1/3 x -3 = -1
(5 - 2)/(x - 1) = -3
3 / (x - 1) = -3
So (x - 1) = -1
x = 0