Practice: Equations of Parallel and Perpendicular Lines

If lines 𝑦=𝑎𝑥+𝑏 and 𝑦=𝑐𝑥+𝑑 are perpendicular, which of the following products equals 1?

  • A𝑎 and 𝑑
  • B𝑏 and 𝑐
  • C𝑏 and 𝑑
  • D𝑎 and 𝑐

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