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Itik=y
6x+10y=530.000
3x+4y=230.000
*dieliminasi menjadi
6x+10y=530.000
6x+8y=460.000
---------------------- -
2y= 70.000
y= 35.000
*disubstitusikan
3x+4.35000=230.000
3x= 230.000 - 140.000
3x= 90.000
x= 30.000
harga 8 ekor ayam adalah 8x30.000= 240.000