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2x + 2y + 2z = 24
----------------------- --
-3y = -12
y = 4
*) x + y + z = 12
x + 4 + z = 12
x + z = 12 - 4
x + z = 8............. pers. (1
*) 3x + 2y - z = 8
3x + 2(4) - z = 8
3x - z = 8 - 8
3x - z = 0........ pers. (2
*) dari pers. 1 dan pers. 2
3x - z = 0
x + z = 8
------------ +
4x = 8
x = 2
*) x + y + z = 12
2 + 4 + z = 12
6 + z = 12
z = 12 - 6
z = 6
jadi, x = 2, y = 4, z = 6