ECZ 2017 · O-Level Paper 1 — Coordinate Geometry
The equation of a straight line L is 2y = 4x − 5. Find the equation of the line passing through (−2, 3) and perpendicular to L.
- A. y = 2x + 7
- B. y = −½x + 1
- C. y = −½x + 2
- D. y = −½x − 1
Verified working — step 1
L is y = 2x − 2.5 (gradient 2), so the perpendicular gradient is −½. Then y − 3 = −½(x + 2) = −½x − 1, giving y = …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.
Have a different question?
Search it — if it is from a past paper or a school mock, chances are we have it worked out, or one that uses the same method.
Search any past-paper question