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pensil = y
8x+6y=18.000 |×5| -> 40x+30y=90.000
6x+5y=13.000 |×6| -> 36x+30y=78.000
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4x=12.000
x= 12.000/4 = 3.000
6x+5y=13.000
6(3.000)+5y=13.000
18.000+5y=13.000
5y=13.000-18.000
y=-5000/5 = -1000
maka harga 5x+8y
5(3000)+8(-1000)
15.000-8000= 7000
jadi harga 5 buku tulis dan 8 pensil adalah Rp. 7.000,00