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Solve the simultaneous equations: 6x + 3y = 42 4x + 7y = 38

6x + 3y = 42 => y = 14 - 2x (1 method mark)4x + 7y = 38 (substituting in y) => (1 method mark) 4x + 7(14 - 2x) = 384x + 98 - 14x = 38-10x + 98 = 3860 = 10x => x = 6 (1 answer mark) => y = 14 - 2(6) = 14 - 12 = 2 (1 answer mark)

Answered by Daniel T. • Maths tutor

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