Quadratic simultaneous equations by substitution - GCSE maths grade 8 ish

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This question is fairly challenging and aimed at around grade 8 GCSE maths. It deals with solving quadratic simultaneous equations by substitution, and will need good algebra confidence. The whole idea is to, in this case, make x the subject, and 'substitute' into the circle equation.

Solve:
x - 2x = 3
x^2 + y^2 = 18

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