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1 pensil= 1800
pake SPLD yg campuran substitusi sama eliminasi aja,lebih gampang
3 buku + 1 pensil = 9000 | x2 | buku + 2 pensil = 18.000
------------------------------- -
4 pensil = 17.200
pensil = 17.200 : 4
= 4.300
2 buku + 2 pensil = 9000
2 buku + 2 ( 4.300) = 9000
2 buku + 8.600 = 9000
2 buku = 9000 - 8.600
2 buku = 400
buku = 400 : 2
buku = 200
jadi 1 buku + 1 pensil = 4.300 + 400 = Rp. 4.700