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4x+5y-2z = -3
3x+4y-3z = -7
eliminasi x dan z dari pers 1 dan 2:
4x-4y - 2z = 6
4x+5y-2z = -3 (-)
-9y = 9
y = -1
eliminasi z dari pers 2 dan 3:
12x-6z = 6
6x-6z = -6 (-)
6x = 12
x = 2..... maka z = 3
maka x, y, z = 2, -1, 3...........ga ada di pilihan