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Non-vertical lines with slopes m1 and m2 are perpendicular when
Am1 + m2 = 0
Bm1 = m2
Cm1/m2 = 1
Dm1 × m2 = -1
Answer & Solution
Correct answer: D. m1 × m2 = -1
The product of slopes of two perpendicular non-vertical lines is -1.
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