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harga gasing = y
maka :
3x + 5y = 9.000 ....dikali 2
5x + 10y = 17.500
menjadi :
6x + 10y = 18.000
5x + 10y = 17.500-
x = 500
subtitusi nilai x :
3x + 5y = 9.000
3(500) + 5y = 9000
y = 9000-1.500 / 5
y = 1.500
jadi harga 1 lusin kelereng = 500 x 12 = Rp 6.000
5x + 10y = 17.500
yang atas dikali 2
6x + 10y = 18.000
5x + 10y = 17.500
dieleminasi
x = 500
1 lusin = 12 buah
12 x 500 = 60.000
maaf jika salah