0.9. Решите систему уравнений: (х - у = 2, 1) 4) 2х - Зу = -1; [2(x+y)- x = -6, | 3х - (x-y) = 0; (х+ Бу = -2, |0, 5x - y = 6; 4х = -бу, 2) 17y – 2x = 20; 5) 3) (8x - Зу = 7, 3х +y= 9; (2x + 3(x+y) = 11, 6) | 7(x+3y) - 4у = -23.