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Kalikan 4x + y = 7 dengan 2, sehingga menjadi 8x + 2y = 14
kemudian eliminasi y
8x + 2y = 14
3x - 2y = 8
------------------ +
11x = 22
x = 2
masukkan nilai x kesalah satu persamaan
3x - 2y = 8
3.2 - 2y = 8
6 - 2y = 8
- 2y = 2
y = -1
Baru masukkan kedua nilai ke persamaan
y - 10x
= -1 - 10.2
= -1 -20
= -21