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The slopes are negative reciprocals.
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
If you have two lines that have negative recipricals (1 and -1 for example), the lines are perpendicular.
perpendiculars("Opposite" is a pretty arbitrary condition in math. The slopes are negative reciprocals.)and by negative that person means the opposite of what it is already, negative or positive, it's not always negative