persamaan linear 4x+y-3z=11 2x-3y+2z=9 x+y+z=-3

4x + y - 3z = 11
2x - 3y + 2z = 9
x + y + z = - 3

x = - 3 - y - z

2x - 3y + 2z = 9
2(- 3 - y - z) - 3y + 2z = 9
- 6 - 2y - 2z - 3y + 2z = 9
- 5y = 9 + 6
- 5y = 15
- y = 3
y = - 3

4x + y - 3z = 11
4(- 3 - y - z) + y - 3z = 11
- 12 - 4y - 4z + y - 3z = 11
- 12 + 12 - 4z - 3 - 3z = 11
- 7z = 11 + 3
- 7z = 14
- z = 2
z = - 2

x + y + z = - 3
x - 3 - 2 = - 3
x = - 3 + 3 + 2
x = 2