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WAEC Further Mathematics 2020 Question 36

Question 36

Coordinate Geometry

P(3, 4) and Q(−3, −4) are two points in a plane. Find the gradient of the line that is normal to the line PQ.

  1. A.4/3
  2. B.3/4
  3. C.−3/4
  4. D.−4/3
Show the answer and explanation

Answer: C (−3/4)

Explanation

PQ has gradient 8/6 = 4/3, so the normal has gradient −3/4.