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-5/3 it is always the opposite reciprocal for a perpendicular slope
Th opposite reciprocal. So if one line has a slope of 2 then the other line will have a slope of -1/2
The speed. Also, if a positive slope represents the speed in one direction, the negative slope is the speed in the opposite direction.
If the original slope is 0, then the opposite reciprocal of 0 is still 0. Oops! Reciprocal of 0 (n/0) is undefined! A vertical line has undefined slope, the horizontal line has slope of 0.
Each pair of opposite sides has equal slopes.