Question

Прошу помогите !!!!!!!

Answer 1

Ответ: x=4 ; y=3

$\left \{ {{2x + y = 11} \atop {6x - y = 21}} \right. + \\ 8x = 32 \\ x = 4 \\ \\ 2x + y = 11 \\ 2 \times 4 + y = 11 \\ 8 + y = 11 \\ y = 3$