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A vertical line has a slope of infinity.
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 a line becomes extremely large in magnitude as the line approaches being vertical;and is undefined or infinite for a truly vertical line.
A vertical line HAS NO slope! The slope is undefined in this case.
The slope of a vertical line is not defined.