Question

Resolva o sistema formado pelas equacoes 2x +y =10 e x-y=2

Answer 1

Resposta:

$x = 2 + y \\ \\ 2x + y = 10 \\ 2(2 + y) + y = 10 \\ 4 + 2y + y = 10 \\ 3y = 6 \\ y = \frac{6}{3} \\ y = 2 \\ \\ x - y = 2 \\ x - 2 = 2 \\ x = 4$