The slope of parallel lines are the same, but the slope of perpendicular lines are negative reciprocals of each other.
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If you have two lines that have negative recipricals (1 and -1 for example), the lines are perpendicular.
Negative reciprocals of one another.
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.
one slope is the negative reciprocal of the other
It took me forever to find this answer, but the answer is "Reciprocals" Good Luck!