An undefined slope is just a line straight down. The slope is undefined.
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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.
You don't, because it is undefined.
then the slope is x=y. there is no slope.
zero is horizontal, undefined is vertical
The slope of the x-axis is zero.The slope of the y-axis is "undefined" or "infinity". Whichever term you use, it's nota number that can participate in ordinary arithmetic operations. So the product ofthe slopes can't be calculated.For any other two perpendicular lines, the product of their slopes is -1 .