Решите систему уравнений : {3 - (x-2y) - 4y=18 {2x-3y+3=2 (3x-y)

Система уравнений:

{ 3 - (x - 2 * y) - 4 * y = 18, 2 * x - 3 * y + 3 = 2 * (3 * x - y);

{ 3 - x + 2 * y - 4 * y = 18, 2 * x - 3 * y + 3 = 2 * 3 * x - 2 * y;

{ 3 - x - 2 * y = 18, 2 * x - 3 * y + 3 = 6 * x - 2 * y;

{ 3 - 18 = x + 2 * y, 2 * x - 3 * y - 6 * x + 2 * y = - 3;

{ - 15 = x + 2 * y, - 4 * x - y = - 3;

{ - 15 = x + 2 * y, y = 3 - 4 * x;

1) - 15 = x + 2 * y;

- 15 = x + 2 * (3 - 4 * x);

- 15 = x + 2 * 3 - 2 * 4 * x;

- 15 = x + 6 - 8 * x;

- 15 = - 7 * x + 6;

- 7 * x = - 21;

x = 3;

2) y = 3 - 4 * 3 = 3 - 12 = - 9;

Ответ: (3; - 9).