Question

How do you find the slope if it exists of x = -3?

Answer 1

The slope of this line does not exist.

Explanation:

Slope is only defined for lines on which there are two points: `(x_1, y_1)` and `(x_2, y_2)` with `x_1 != x_2`

This is because we use `(y_2-y_1)/(x_2-x_1)` to define the slope, but division by zero is not defined.
And if `x_1 = x_2`, then `x_2-x_1 = 0`.