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Full topic overview
Level 3 simultaneous equations (AS91587) extends the linear systems from Level 2 to three equations in three unknowns. The core skill is elimination: reducing a 3×3 system down to a 2×2 system, then to a single equation, and back-substituting. You also need to interpret the nature of the solution — deciding whether a system has one, infinitely many, or no solution and justifying why — and form a system from a real context and solve it.