Question

X+5y=11
3x-y=1
Qual o valor do y

Answer 1

Resposta:

$x + 5y = 11 \\ 3x - y = 1 \\ \times = 11 - 5y \\ \\ 3 \times (11 - 5y) - y = 1 \\ 33 - 15y - y = 1 \\ - 15y - y = 1 - 33 \\ - 16y = - 32 \times ( - 1) \\ 16y = 32 \\ y = \frac{32}{16} \\ y = 2 \\ \\ x + 5 \times 2 = 11 \\ x + 10 = 11 \\ x = 11 - 10 \\ x = 1$