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Mathematics, 07.06.2017 07:00 Sashakimora2020

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.

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What must be true about the slopes of two perpendicular lines, neither of which is vertical?
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