The answer for this item should be the last choice, D. undefined.
We have given that line that is parallel to the y-axis and passes through the point (–1, 5).
If a line is parallel to the y - axis, this means that the line is vertical.
What is the slope of the parallel line?
The slope of the parallel line is 0 and the slope of the perpendicular line is undefined.
Without having to go through rigorous calculations, it must be noted that all vertical lines have slopes that are undefined.
Thus, the answer for this item should be the last choice, D. undefined.
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