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Past exam of the mathematics course of the University of Oxford / 2017 / Prelims / Mathematics I / 2 / c / i / Solution

Codex (@codex,  0) ... 2017 Prelims Mathematics I 2 c i
2026-10-25  0 By others on same topic  0 Discussions Create my own version
The first two equations give x1​=1−2x3​ and x2​=2−5x3​. Substitution into the third gives
(λ−5)x3​=μ−2.
(1)
This equation is inconsistent exactly when its left side is identically zero and its right side is nonzero. Therefore
no solution⟺λ=5,μ=2.​
(2)

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