The question is obscure, and incomplete. There are many ways we can interpret an equation, such as x = -2, or its alternate form: x + 2 = 0
This is a vertical line at x = -2, since the y variable will change in relation to its x-ordinate. Since, at all values of x it's constant, then the only changes we can make out here are its y counterparts.
The first attachment is the image of the equation.
Furthermore, we can geometrically describe this equation as a straight line. From the graph above, we can see that x = -2 is merely a vertical line with its root at x = -2.
We can also visualise and represent this on a number line, rooted at x = -2. The second attachment is a visual representation of x = -2 as a value on the number line.