It took me forever to find this answer, but the answer is "Reciprocals" Good Luck!
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I believe they have Negative Slopes as stated by my Geometry Book. "Perpendicular Lines Have Slopes Which Are Negative ___"
Negative reciprocals of one another.
Yes, as long as the negative slopes are both equal.
If you have two lines that have negative recipricals (1 and -1 for example), the lines are perpendicular.
one slope is the negative reciprocal of the other