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.
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Undefined
Well since the lines are parallel they would have the same slope. And the slope of any horizontal line is 0. The slope of a vertical line is undefined.
the slope is infinite because you have a vertical line. To find a parallel line, the formula would be "x= any number" because that would also give you a vertical line.
x = -3 produces a vertical straight line parallel to the y axis with an x intercept at -3. A vertical line has an infinite (undefined) slope.
It is normally a parallel line parallel to the x or y axes on the Cartesian plane.