please cepet jawab dong… Ge.Ce

2x+y = -7
3z - x = -5
2y-z = -1
Kalikan -2 pada persamaan 2, didapat:
2x - 6z = 10
Berikan kepada pers.1
2x+y = -7
2x - 6z = 10
Kurangi, didapat:
y + 6z = -17
2y + 12z = -34
Berikan pada persamaan 3,
2y+12z = -34
2y - z = -1
Kurangi, didapat:
13z = -33
z = -33/13
Dan,
2y + 33/13 = -1
2y = -46/13
y = -23/13
Dan,
2x+y = -7
2x - 23/13 = -7
2x = -68/13
x = -34/13