Two nonvertical lines have slopes m1 and m2, respectively. The lines are parallel if ___ and the ___ are unequal; the lines are perpendicular if ___.

  1. 👍 1
  2. 👎 1
  3. 👁 1,119
  1. m1 = m2

    m2 = -1/m1

    1. 👍 0
    2. 👎 2

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