If you multiply two reciprocals, their product must be 1.
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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.
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reciprocals, multiplicative inverses
The numbers are negative reciprocals of each other.
It is 0.5