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Order the steps: test three points for collinearity

Exercise and reference answers

Steps
  1. Label the three points A, B and C
  2. Compute the slope of AB from the coordinate differences
  3. Compute the slope of BC the same way
  4. Compare the two slopes
  5. If they are equal, the three points are collinear

Explanation

Two slopes, compared. Source: syllabus Maths, Ch 9 Straight Lines.
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