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4x+3y =12500 persamaan 1
2x+y = 5500 persamaan 2
2x+y = 5500 menjadi y = 5500-2x
4x+3y = 12500
4x+3(5500-2x) = 12500
4x+16500-6x = 12500
4x-6x = 12500-16500
-2x = -4000
x = -4000/-2
x = 2000
y = 5500 - 2x
y = 5500 - 2(2000)
y = 5500 - 4000
y = 1500
Jadi, harga x = Rp.2000 dan y = Rp. 1500