Arturo O. answered 07/21/20
Experienced Physics Teacher for Physics Tutoring
y = mx + b
The product of slopes of perpendiculars lines is -1, so the slope of the perpendicular line is
m = -1/-3 = 1/3
y = (1/3)x + b
Find b from the given point.
5 = (1/3)(6) + b
You should be able to finish from here.