Question

Помогите 20 баллов !!!!!!!!!!!!!!!!!!!

Answer 1

Ответ:

$2(3x - 4y) - 4(y + 5) = 4 \\ 3(8y - 5) - (7 - 2x) = - 42 \\ \\ 6x - 8y - 4y - 20 = 4 \\ 24y - 15 - 7 + 2x = - 42 \\ \\ 6x - 12y = 24 \\ 2x + 24y = - 20 \\ 6x - 12y = 24 \\ x + 12y = - 10 \\ 7x = 14 \\ x = 2 \\ 6 \times 2 - 12y = 24 \\ - 12y = 24 - 12 \\ - 12y = 12 \\ y = - 1$