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JAMB Mathematics 1982 Question 46

Question 46

Variation

A variable y is inversely proportional to x2, when y = 10, x = 2. What is y when x = 10?

  1. A.2
  2. B.4
  3. C.100
  4. D.0.4
  5. E.0.1
Show the answer and explanation

Answer: D (0.4)

Explanation

y = k/x². 10 = k/4 gives k = 40, so at x = 10, y = 40/100 = 0.4.