ECZ 2024 · O-Level Paper 1 — Coordinate Geometry
A straight line L is perpendicular to the line y = 3x + 4. Given that line L passes through the point (3, a) and has 3 as its y intercept, find the value of a.
- A. -2
- B. 4
- C. 3
- D. 2
Verified working — step 1
Perpendicular gradients multiply to -1, so L's gradient is the negative reciprocal of the given line's gradient.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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