ECZ 2013 · O-Level Paper 1 — Variation
y varies directly as x and inversely as 2m - 1, with constant k = 5 (so y = 5x2m - 1). Find the value of m when y = 2 and x = 4.
- A. 10
- B. 11
- C. 5.5
- D. 5
Verified working — step 1
m hides in the denominator - multiply up to free it, then undo the -1 and the doubling.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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