ECZ 2013 · O-Level Paper 1 — Variation
Given that y varies directly as x and inversely as 2m - 1, and that y = 5 when x = 7 and m = 4, calculate the constant of variation, k.
- A. 5
- B. 35
- C. 7
- D. 1
Verified working — step 1
y = kx2m - 1. Substituting: 5 = 7k8 - 1= 7k7= k, so 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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