ECZ 2024 · GCE Paper 1 — Variation

Given that y varies directly as x and inversely as the square of z, and k = 2, find the values of z when x = 25 and y = 2.

  • A. z = 10 or z = -10
  • B. z = 5 only
  • C. z = 5 or z = -5
  • D. z = 25 or z = -25

Verified working — step 1

2 = 225z2

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Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.

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