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WAEC Mathematics 2002 Question 15

Question 15

Variation

If (x + 3) varies directly as y and x = 3 when y = 12, what is the value of x when y = 8?

  1. A.1
  2. B.1/2
  3. C.−1/2
  4. D.−1
Show the answer and explanation

Answer: A (1)

Explanation

x + 3 = ky: 6 = 12k, so k = 1/2. When y = 8, x + 3 = 4 and x = 1.