Question

which of the following lines is perpendicular to the x-axis
a. y = 1
b. y = x
c. x = 1
d. x = -y

Answer 1

A line that is perpendicular to the x-axis is a vertical line. In your options, the line that represents a vertical line is:

**c. x = 1**

This line is vertical and therefore is perpendicular to the x-axis. The other options represent horizontal lines or sloped lines, which are not perpendicular to the x-axis.