Answer:
Undefined
Step-by-step explanation:
Slope can be found using:
[tex]m=\frac{y_{2}-y_{1} }{x_{2}-x_{1} }[/tex]
Let's call (18, -5) our first pair, and (18,20) our second
So, x1 is 18, x2 is 18, y1 is -5, and y2 is 20, and we can substitute them in [tex]m=\frac{20- -5}{18-18}[/tex]
[tex]m=\frac{25}{0}[/tex]
Since any number divided by 25 is undefined, the slope is undefined
