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buku (x)
pensil (y)
15x + 3y = 33.000 | ×1
10x + y = 21.000 | ×3
* 15x + 3y = 33.000
* 30x + 3y = 63.000 (dikurang)
-15x = -30.000
x = 2000
10x + y = 21000
10(2000) + y = 21.000
20.000 + y = 21.000
Y = 1000
jadi buku = 2000
pensil = 1000