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buku = x
pensil=y
4x+3y=12.500 l x1 l 4x+3y=12.500
2x+y=5.500 l x2 l 4x+2y=11.000
y=1.500
y=1.500 ---> 2x+y = 5.500
2x+1.500=5.500
2x=5.500-1.500
2x=4000
x=4000:2
x=2000
jadi, harga sebuah buku adalah rp.2000
harga sebuah pensil rp.1.500
4x + 3y = 12500
2x + y = 5500
4x + 3y = 12500
4x + 2y = 11000
——————————
y = 500
2x + y = 5500
2x + 500 = 5500
2x = 5500 - 500
2x = 5000
x = 2500
harga buku 2500
harga pensil 500