ECZ 2011 · O-Level Paper 1 — Variation
Given that x varies as y and inversely as z2, and that x = 12 when y = 3 and z = 2, find the equation connecting x, y and z.
- A. x = 4yz2
- B. x = 16yz2
- C. x = 16yz2
- D. x = y16z2
Verified working — step 1
Write x = kyz2. Substituting gives 12 = 3k4, so k = 16 and x = …The full step-by-step working and final answer are included with Premium — checked against ECZ marking standards.
Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.
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