Question

2x+4y=8
2x+2y = 2

(método da comparação)​

Answer 1

$2x + 4y = 8 \\ x = \frac{8 - 4y}{2} \\ 2x + 2y = 2 \\ x = \frac{2 - 2y}{2} \\ \frac{8 - 4y}{2} = \frac{2 - 2y}{2} \\ 16 - 8y = 4 - 4y \\ 12 = 4y \\ y = 3 \\ x = \frac{8 - 4y}{2} \\ x = - 2$