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 values of y when x = 30 and z = 5.
- A. y = ±6
- B. y = 6 only
- C. y = ±36
- D. y = ±√5
Verified working — step 1
z = 6xy² gives 5 = 6 × 30 ÷ y² = 180y². So y² = 180 ÷ 5 = 36 and y = …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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