For the graph y = -8 find the slope of a line that is perpendicular to it and the slope of a line parallel to it. Explain your answer with two or more sentences.

Question

For the graph y = -8 find the slope of a line that is perpendicular to it and the slope of a line parallel to it. Explain your answer with two or more sentences.

Answer 1

y = -8

That is a horizontal line, so the perpendicular line must be a vertical line, whose slope is not defined.

A line parallel to y=-8 is also a horizontal line, and its slope is zero.