A number cannot have a perpendicular!
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I believe they have Negative Slopes as stated by my Geometry Book. "Perpendicular Lines Have Slopes Which Are Negative ___"
The negative reciprocal of the slope of the line to which it is perpendicular.
Line a with a slope perpendicular to that of line b has a slope that is the negative reciprocal of line b's. So basically the negative reciprocal.
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one slope is the negative reciprocal of the other