Actually it IS. perpendicular lines have opposite reciprocal slopes and parallel lines have the same slope.
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I suppose you mean what is an opposite reciprocal? At any rate, we should start there. The opposite reciprocal is -(1/x) so let's take the number 5. The opposite reciprocal would be -1/5. If you want two lines to be perpendicular you must take the original slope of the first line and change it to its opposite reciprocal. For example: y=5x A line perpendicular to this line would be y=-1/5x.
Slopes of line perpendicular to the x-axis are undefined.
2
6
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