ECZ 2015 · O-Level Paper 1 — Variation

y is proportional to x3 with constant of variation k = 14, so y = (14)x3. Find y when x = 4.

  • A. 16
  • B. 1
  • C. 100
  • D. 64

Verified working — step 1

The rule is y = (14)x3 - cube the x first, then take the quarter.

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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