Respuesta :

Answer:

y = 3x - 10

Step-by-step explanation:

y = -1/3 x + 7

m = - 1/3

slope of perpendicular line m' = - 1/m = 3

for point (4,2)

y = m'x + b  ... y intercept

y = 3 x + b

b = y - 3x = 2 - (3 x 4) = - 10

equation of perpendicular line:   y = 3x - 10