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4 votes
Any line with an undefined slope is parallel to the

User Wahkuna
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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.
User 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
User Prisacari Dmitrii
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7.7k points

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