ECZ 2022 · O-Level Paper 1 — Variation
y varies directly as the square of x and inversely as z, and y = 2 when x = 4 and z = 24. Find the values of x when y = 8 and z = 6.
- A. x = 4 only
- B. x = 4 or x = -4
- C. x = 16 or x = -16
- D. x = 2 or x = -2
Verified working — step 1
Build the formula from the words, find the constant from the first set of values, then solve for x.The full step-by-step working and final answer, plus the video lesson for this topic, 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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