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2x - y = -7
5x - 6y = -21
-2x + 5y = 2z - 1
Pada persamaan 1 dan 2 perlu dieliminasi.
Persamaan 1 kalikan 6.
12x - 6y = -42
5x - 6y = -21
- - - Kurangi - - -
7x = -21
x = -3
Substitusikan ke sembarang persamaan:
2x - y = -7
2(-3) - y = -7
-6 - y = -7
y = -6 + 7
y = 1
Sehingga untuk persamaan 3:
-2x + 5y = 2z - 1
-2(-3) + 5(1) = 2z - 1
6 + 5 = 2z - 1
2z -1 = 11
2z = 12
z = 6