Slope of the line through each ordered pair of points
(18,-5)(18,20)

Undefined

Step-by-step explanation:

Slope can be found using:

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

Since any number divided by 25 is undefined, the slope is undefined

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