Find the equation of a line that is perpendicular

Question

Find the equation of a line that is perpendicular to the line x=-11 and contains the point (3,5)

Answer 1

You know that

 

x = -11

 

represents a vertical line, so the perpendicular line must be a horizontal line, i.e. a line represented by

 

y = constant.

 

Sine it passes through (3,5), you can figure out right away the value of the constant and finish from here.