Question

Describes the graph of the equation x = -2. Is the equation a function

A. Horizontal line; no

B. Horizontal line; yes

C. vertical line; no

D. Vertical line; yes

Answer 1

Here there's only one variable: x. We are told that x = -2. Find -2 on the x-axis and draw a vertical line thru this point. That's it. Vertical line, NO, because when x=-2, more than one y-value is associated with it.