The points A(1, 1), B(3, 5) and C(5, 9) are collinear because:

  1. they have positive coordinates
  2. AB = BC
  3. mAB = mBC = 2
  4. mAB mBC = -1
Answer

C) mAB = mBC = 2

mAB = 5 - 13 - 1 = 2 and mBC = 9 - 55 - 3 = 2; equal slopes through the common point B mean one straight line. SLO M-09-B-05 · Understanding

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