Question

A line that is perpendicular to y = -1 is a vertical line. Vertical lines have an undefined slope. True False

Answer 1

True

Explanation:

Horizontal lines with equation y = c where c is the value of the y- coordinates the line passes through are parallel to the x- axis and have a slope of zero.

Vertical lines with equation x = c where c is the value of the x- coordinates the line passes through are parallel to the y- axis and have an undefined slope.