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WAEC Mathematics 2012 Question 43

Question 43

Variation

If x and y are variables and k is a constant, which of the following describes an inverse relationship between x and y?

  1. A.y = kx
  2. B.y = k/x
  3. C.y = k√x
  4. D.y = x + k
Show the answer and explanation

Answer: B (y = k/x)

Explanation

In inverse variation, y = k/x: as x increases, y decreases.