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# What must be true about the slopes of two perpendicular lines, neither of which is vertical? select one: a. the slopes have product -1. b. one of the slopes must be 0. c. the slopes have product 1. d. the slopes are equal.   ### Another question on Mathematics Mathematics, 04.02.2019 20:30
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What must be true about the slopes of two perpendicular lines, neither of which is vertical?
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