ECZ 2021 · GCE Paper 1 — Variation
Given that z varies as x and inversely as the square of y, with constant of variation k = 6, find the value of z when x = 18 and y = 3.
- A. 4
- B. 12
- C. 36
- D. 108
Verified working — step 1
With k = 6 the rule is z = 6xy2 - substitute the given values, squaring y before dividing.The full step-by-step working and final answer, plus the video lesson for this topic, 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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