ECZ 2021 · O-Level Paper 1 — Variation

It is given that y varies directly as 2x and inversely as z2 and y = 4 when x = 8 and z = 2. Find the (c) values of z when x = 24 and y = 3.

  • A. z = 4 or z = -4
  • B. z = 16 or z = -16
  • C. z = 2 or z = -2
  • D. z = 4 only

Verified working — step 1

y = 2xz2

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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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