ECZ 2017 · GCE Paper 1 — Matrices
Given that [2 x; −5 1] [4; 3] = [14; −17] (rows separated by semicolons), find the value of x.
- A. 6
- B. 2
- C. −2
- D. 3
Verified working — step 1
The top entry gives (2)(4) + (x)(3) = 14, so 8 + 3x = 14, 3x = 6 and x = 2. (The bottom row checks: −20 + 3 = …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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