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- x + 2y = 4 kalikan dengan - 2 sehingga menjadi 2x - 4y = - 8 ... (2)
jumlahkan persamaan (1) dan persamaan (2), sehingga diperoleh :
- 2x - 3y + 2x - 4y = 6 - 8
- 7y = - 2
substitusi pada persamaan (1) sehingga didapatkan :
- 2x - 3()=6
- 2x = 6 + =
x =
-u + 2y = 4 dikalikan -2
menjadi
2u + 3y = -6
2u - 4y = -8 _
7y = 2
y = 2/7
maka u
2u + 3y = -6
2u + 3 (2/7) = -6
2u + 6/7 = -6
2u = -6 : 6 / 7
2u = -6 x 7/6
2u = -7
u = -7/2