Answer:
The slope here is undefined.
Explanation:
The two points shown here are (4, 0) and (4, 1). To find the slope do (y B − y A) /(x B − x A).
(1 - 0)/(4 - 4)
Any number subtracted by 0 gets you itself. Any number subtracted byt he same number gets you zero.
1/0
You can't divide by zero, so the slope is undefined.