The lines 3x + 4y - 1 = 0 and 4x - 3y + 5 = 0 are:

  1. parallel
  2. the same line
  3. neither parallel nor perpendicular
  4. perpendicular
Answer

D) perpendicular

Slopes: m1 = - 34, m2 = 43. Their product is -1, so the lines are perpendicular. SLO M-09-B-05 · Understanding

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