Answer:
undefined
Explanation:
You want the slope of the line through the points (7, -4) and (7, 0).
Vertical line
A line through two points with the same x-coordinate is a vertical line. The slope is "undefined."
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Additional comment
The slope is the ratio of rise to run. Here, the vertical difference between the two points is 4, and the horizontal difference is 0. The ratio rise/run is ...
m = rise/run = 4/0 = undefined
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