Question

which is the equation of a line parallel to x=-9? x=3 undefined y=-9 y=x

Explanation:

Step1: Identify line type

The equation $x = - 9$ represents a vertical line where for all values of $y$, $x=-9$.

Step2: Find parallel line

A line parallel to a vertical line is also a vertical line. Vertical - line equations are of the form $x = k$, where $k$ is a constant. Among the options, $x = 3$ is a vertical line.

Answer:

$x = 3$