Chapter 1 - Graphs - 1.3 Lines - 1.3 Assess Your Understanding - Page 30: 32

$x=-2$. See graph.

Step 1. Given point $P(-2,0)$ and an $undefined$ slope, we know that the line is vertical in the form of $x=a$, thus the equation is $x=-2$. Step 2. We can plot the above line as shown in the figure. See graph.