Question

(c) does a line perpendicular to a horizontal line have slope 0?
yes
no, a line perpendicular to a horizontal line will have a negative slope.
no, a line perpendicular to a horizontal line will have a positive slope.
no, a line perpendicular to a horizontal line will have an undefined slope.
no, a line perpendicular to a horizontal line could be horizontal, vertical, or neither.

Explanation:

Step1: Recall slope properties

A horizontal line has a slope of \(0\). A vertical line has an undefined slope. The slope of a line perpendicular to a horizontal line is undefined (vertical line), not \(0\).

Answer:

No, a line perpendicular to a horizontal line will have an undefined slope.