ECZ 2020 · O-Level Paper 1 — Coordinate Geometry
The points A and B are (-5, 15) and (3w, w) respectively. Given that the midpoint of the straight line joining A and B is (5, 10), find the value of w.
- A. 103
- B. -5
- C. 253
- D. 5
Verified working — step 1
Each midpoint coordinate is the AVERAGE of the matching endpoint coordinates - one coordinate is enough to trap w, and the other checks it.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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