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pensil = y
4x+3y = 12500 (kali 2)
2x+y = 5.500 ( kali 4)
8x+6y = 25.000
8x+4y = 22.000- (selisih/dikurang)
2y = 3.000
y = 3.000/2
y = 1.500
8x+4y = 22.000
8x+ 4(1.500) = 22.000
8x= 22.000-6.000
x = 16.000/8
x = 2.000
jadi , buku seharga 2.000 dan pensil seharga 1.500
demikian