Question

Which of the equations below represents a line perpendicular to the x-axis?

A. x=3
B. x=3y
C. x=y
D. x=-3y

Answer 1

the x-axis is horizontal, so if the equation is perpendicular to the x-axis, it's vertical

vertical functions take the form x = ___ (where a constant goes into the blank)

with that said, which answer choice do you think fits this description?

Answer 2

*vertical equations, really, but you get the idea

Answer 3

A. x=3
About how the graph of the line x=3 looks it’s a straight line up and down therefore perpendicular to the x axis