Question

write the equation of the line.

Explanation:

Step1: Identify line type

The line is vertical, so its equation has the form $x = a$, where $a$ is the constant x-value of all points on the line.

Step2: Find x-intercept

The vertical line passes through $x = -400$ (all points on the line have an x-coordinate of -400).

Answer:

$x = -400$