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WAEC Mathematics 1995 Question 16

Question 16

Variation

If y ∝ 1/x2 and x = 3 when y = 4, find y when x = 2

  1. A.1
  2. B.3
  3. C.9
  4. D.18
  5. E.21
Show the answer and explanation

Answer: C (9)

Explanation

y = k/x²; 4 = k/9 gives k = 36. When x = 2, y = 36/4 = 9.