Answer:
see the explanation
Explanation:
we have the points
(4,7) and (4,-3)
we know that
The x=coordinate of both points are the same
so
the line that goes through those two points is a vertical line (parallel to the y-axis)
The slope is undefined
Because
The formula to calculate the slope between two points is equal to

substitute the values


Is undefined (the denominator is equal to zero)
see the attached figure to better understand the problem