Any line with an undefined slope is parallel to the

asked Mar 16, 2018 32.7k views

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4 votes

Vertical lines and horizontal lines. The slope of the perpendicular line would be the slope of a vertical line.

Jilla answered Mar 18, 2018

by Jilla

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5 votes

slope=rise/run
when rise=0, it is undefined
that is only when the line goes left and right
paralell to x axis

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