Question

$3x + y = 13 \\ x - 2y = 2$
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Answer 1

Resposta:

$3x + y = 13 \\ x - 2y = 2 \\ \\ y = 13 - 3x \\ x - 2(13 - 3x) = 2 \\ \\ y = 13 - 3x \\ x - 26 + 6x = 2 \\ \\ y = 13 - 3x \\ 7x = 2 + 26 \\ \\ y = 13 - 3x \\ 7x = 28 \\ \\ y = 13 - 3x \\ x = 28 \div 7 \\ \\ y = 13 - 3(4) \\ x = 4 \\ \\ y = 13 - 12 \\ x = 4 \\ \\ y = 1 \\ x = 4$