# What is the slope of a line that is parallel to a vertical line?

Any line that is parallel to a vertical line is also vertical and has undefined slope.

which is undefined.

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A vertical line and all lines parallel to it have undefined slopes

Note that if a line is vertical, all lines parallel to it are also vertical.

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The slope of a line that is parallel to a vertical line is undefined.

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The slope of a line that is parallel to a vertical line is undefined.

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