Решите задачу:
4x - y = 11 /*5 2x + 5y = 11 20x - 5y = 55 2x + 5y = 11 -------------------- + 22x = 66 x = 3 y = 4x - 11 = 4*3 - 11 = 12 - 11 = 1 Ответ (3; 1)