Line L has an undefined slope. Line M is perpendicular to line L. Which of the following could be the equation of line M?

A) x = y
B) y = 7
C) x = -3
D) xy = 4

Respuesta :

The correct answer is B.

An undefined slope is indicated by:
x= a number, which looks like a vertical line.

A line perpendicular to that is indicated by:
y = a number, which looks like a horizontal line.