ECZ 2025 · O-Level Paper 1 — Coordinate Geometry
In the following diagram, P is the point (0, 4), Q is the point (-4, 0) and O is the origin. Find the equation of a straight line through O which is perpendicular to line PQ.
- A. y = x - 4
- B. y = -x + 4
- C. y = -x
- D. y = x
Verified working — step 1
First find the gradient of PQ: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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