Question

Which of the equations below represents a line perpendicular to the x-axis?

A. X=3
B. X=3y
C. X=y
D. X=-3y

Answer 1

Answer: A. x = 3

This is a vertical line that goes through 3 on the x axis. Two points on this line are (3,0) and (3,1). Any vertical line is perpendicular to the x axis.