Because slope is defined as change in y over change in x, for a vertical line your change in x is zero. Dividing by zero gives an undefined answer.
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A vertical line has an undefined slope. For the line to be parallel to a vertical line, the slopes would have to be the same. Therefore, the line parallel to a vertical line also has an undefined slope.
The slope of any vertical Line is undefined because anything divided by zero is undefined.
The slope of a line is undefined if the line is vertical.
A vertical line.
No, the slope is undefined