ECZ 2018 · O-Level Paper 1 — Variation
y varies directly as the square of x and y = 96 when x = 4. Find the values of x when y = 24.
- A. x = 4 or x = -4
- B. x = 2 or x = -2
- C. x = 1 or x = -1
- D. x = 2 only
Verified working — step 1
"Directly as the square of x" means y = kx2, so find k from the pair you are given before solving 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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