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WAEC Mathematics 2018 Question 3

Question 3

Variation

Given that y varies inversely as the square of x. If x = 3 when y = 100, find the equation connecting x and y.

  1. A.yx2 = 300
  2. B.yx2 = 900
  3. C.y = 100x/9
  4. D.y = 9002
Show the answer and explanation

Answer: B (yx2 = 900)

Explanation

y = k/x², so k = yx² = 100 × 9 = 900 and the equation is yx² = 900.