y = 5 is a horizontal, so, the slope is 0.
A perpendicular line to y = 5 will be a vertical line.
A vertical line has a slope that’s undefined.
So, the line perpendicular to y = 5 will have a slope that’s undefined.
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Answer:
undefined
Explanation:
y = 5 is a horizontal line
It has a slope of zero
The line perpendicular to a horizontal line is a vertical line
It would have a slope that is undefined
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