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buku 10.000
2x + 5y = 54.000 .... (1)
10x + 1y = 30.000 .... (2)
(disubtitusikan)
10x + 25y = 270.000
10x + 1y = 30.000
24y = 240.000
y = 10.000 (buku)
y=10.000 disubt. ke pers. (2)
10x + 1y = 30.000
10x + 10.000 = 30.000
10x = 30.000 - 10.000
10x = 20.000
x = 20.000/10
x = 2.000 (pensil)
jadi, harga 1 pensil = 2.000
harga 1 buku = 10.000