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2x - 2y - 2z = 9
3x + 2y + z = 16
jumlahkan
5x - z = 25 .....(1)
.
2x - 2y - 2z = 9........kalikan 3
x - 6y - 3z = - 28.
..
6x - 6y - 6z = 27
x - 6y - 3z = - 28
kurangkan
5x - 3z = 55 ....(2)
..
eliminasi (1) dgn (2)
5x - z = 25
5x - 3z = 55
kurangkan
2z = - 30
z = - 15
.
5x - z = 25
5x = 25 + z
5x = 25 - 15 = 10
x = 2
2x - 2y - 2z = 9
2(2) - 2y - 2(-15) = 9
4 - 2y + 30 = 9
-2y = 9-34 = -25
y = 12,5
(x,y,z)= (2, 12.5 , -15)