Answer:

Explanation:
Normally, linear equations would be written in slope-intercept form, 
 , where
, where 
 is the slope and
 is the slope and 
 is the y-intercept (the value of y when the line crosses the y-axis). However, linear equations for horizontal or vertical lines are organized differently.
 is the y-intercept (the value of y when the line crosses the y-axis). However, linear equations for horizontal or vertical lines are organized differently.
Here, we're given a vertical line. Vertical lines are written like 
 , where
, where 
 is the x-intercept, or the value of x when the line crosses the x-axis.
 is the x-intercept, or the value of x when the line crosses the x-axis.
From the graph, we can tell that the x-intercept is 3. Therefore, our equation would be 
 .
.
I hope this helps!