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WAEC Mathematics 1999 Question 26

Question 26

Variation

If y varies inversely as x2, how does x vary with y?

  1. A.x varies inversely as y2
  2. B.x varies inversely as √y
  3. C.x varies directly as y2
  4. D.x varies directly as √y
Show the answer and explanation

Answer: B (x varies inversely as √y)

Explanation

y = k/x2 gives x2 = k/y, so x = √k/√y: x varies inversely as √y.