ECZ 2015 · O-Level Paper 1 — Variation
Given that y is proportional to x³ and that y = 250 when x = 10, find the value of the constant of variation k.
- A. k = 14
- B. k = 4
- C. k = 25
- D. k = 2.5
Verified working — step 1
y = kx³: 250 = k × 10³ = 1000k, so k = 2501000= …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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