ECZ 2020 · O-Level Paper 1 — Variation
It is given that y varies directly as the cube root of x and inversely as the square of z, and y = 2 when x = 8 and z = 4. Find the values of z when y = 12 and x = 27.
- A. z = 2 only
- B. z = ±4
- C. z = ±16
- D. z = ±2
Verified working — step 1
Find k from the given values first, then solve for z, which sits squared in the denominator.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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