Answer: Slope is undefined
Given the following points
(10, 5) and (10, 3)
Let x1 = 10, y1 = 5, x2 = 10 and y2 = 3
Slope = rise / run
rise = y2 - y1
run = x2 - x1
Slope = y2 - y1 / x2 - x1
Slope = 3 - 5 / 10 - 10
Slope = -2/0
Slope = Undefined
The slope is undefined