# How do you find the slope for x=-7?

##### 1 Answer
Jul 20, 2016

The line is vertical and the slope is undefined.

#### Explanation:

$x = - 7$ is the equation of a vertical line. It cannot be written in standard form.

The slope of a vertical line is undefined, because we end up trying to divide by 0.

$m = \left(\text{vertical change")/("horizontal change}\right) = \frac{y}{0}$

BUt in a vertical line, there is NO horizontal (x) change.

The slope is undefined.