Free ACT Practice Question

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ID: ACT-M-164
Section: Math
Topics: Geometry; Coordinate geometry
Difficulty level: Medium

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If the lines $\dfrac{x}{a} + \dfrac{y}{b} = 1$ and $\dfrac{x}{p} + \dfrac{y}{q} = 1$ are perpendicular to one another, which of the following is correct?

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