ANSWER:
There is no slope or is not defined (undefined slope)
STEP-BY-STEP EXPLANATION:
We have that the slope is calculated by means of the following formula:
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]we replace the points (5, 1) and (5, 3)
[tex]m=\frac{3-1}{5-5}=\frac{2}{0}=\text{ ind}[/tex]Since the division by zero is an indeterminacy, it means that in reality there is no slope, since there is no inclination
