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Negative reciprocals of one another.
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
It took me forever to find this answer, but the answer is "Reciprocals" Good Luck!
Two numbers are negative reciprocals if their product is -1. The numbers 1/2 and -2 are negative reciprocals. Their product is -1. This is often seen in problems involving the slopes of two lines. The slopes of perpendicular lines are negative reciprocals. Their product is -1.