What is the slope of a line that is perpendicular to the line x is equal to negative 3 ?
Answer
A
undefined
B
1 third
C
negative 3
D
0
Explanation
The equation x = -3 describes a vertical line. A line perpendicular to a vertical line is horizontal, and every horizontal line has slope 0, so the correct choice is 0.
AI-written and checked against the verified answer.