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2x+4y=4 |kali 4| = 8x + 16y = 16
dikurangi psamaan 1 dan 2
maka
-12y = -52
16y=16
jadi -12y-16y= -28y dan -52-16= -68
makaa akhirnya -28y= -68
y= -68+28 = -40
Dimasukkan ke psamaan salah satu dr soal,misal dmasukkan di 2x+4y=4 maka jadi 2x+ 4(-40) =4
2x+ (-160)=4
2x=4+160
2x=164
x=164-2=162
jadi x=162 dan y= -40