the slope of a vertical line is 0.
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A vertical line!
The slope is the ratio of the vertical increase divided by the horizontal increase. The slope of a flat line is 0. The slope of a flatter line is smaller than the slope of a steeper line. A positive slop indicates that the line move up from left to right. A negative slope means that the line moves down from left to right.
The slope of the line y = -2 is zero.
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.
A horizontal line is a line perpendicular to the vertical.