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4x+2y=7
dikurang,hasilnya
y=-5
masukkan nilai y=-5 ke dalam salah satu persamaan.
4x+3(-5)=2
4x=2+15
x=17/4
4x+2y=7
jadi ini semua di kurang
y = -5
Subtitusi
4x+3y=2
4x+3(-5)=2
4x+(-15)=2
4x =2+15
4x =17
x = 2