ECZ 2012 · O-Level Paper 1 — Variation
Given that y varies directly as x and z, and that y = 9 when x = 6 and z = 12, find k, the constant of variation.
- A. 9
- B. 12
- C. 13
- D. 3
Verified working — step 1
y = kxz, so 9 = k(6)(12) = 3k, giving k = …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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