Answer
The slope is undefined.
Work Step by Step
To find the slope, we use the formula $m=\frac{y_2-y_1}{x_2-x_1}$.
We plug in the $x$ and $y$ values from the points shown in the graph: $m=\frac{-1-3}{-1-(-1)}$
We simplify above and below the fraction bar with subtraction: $m=\frac{-4}{0}$
Any time we try to divide by $0$, the answer is undefined. Therefore, we have an undefined slope.
