Two non-vertical lines are **perpendicular** if and only if:
AThe product of their slopes is $-1$
BTheir slopes are equal
CTheir slopes are both zero
DThey have the same y-intercept
Answer & Solution
Correct answer: A. The product of their slopes is $-1$
Perpendicular: $m_1 \cdot m_2 = -1$ (slopes are negative reciprocals).
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