ECZ 2025 · GCE Paper 1 — Matrices
Given that −21x−2 31 = −57, find the value of x.
- A. 9
- B. −3
- C. 3
- D. 53
Verified working — step 1
Multiply the second row by the column: x(3) + (−2)(1) = 7, so 3x − 2 = 7, 3x = 9, x = 3. Check with the first row: −2(3) + 1(1) = …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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