1.x = -29/23, y = 22/23;
2. x = 1, y = 2, z = 2;
3.
1)вычитаем -13у=13 → у=-1
2) x+y+z=5 + 2x-y+z=2 = 3x+2z=5
3x-2z=5 + 3x-2y+z=1 = 6x-2y=6
1.x = -29/23, y = 22/23;
2. x = 1, y = 2, z = 2;
3.
1)вычитаем -13у=13 → у=-1
2) x+y+z=5 + 2x-y+z=2 = 3x+2z=5
3x-2z=5 + 3x-2y+z=1 = 6x-2y=6