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buku = b
pensil = p
5b + 2 p = 16.500 (x1) 5b + 2p = 16.500
4b + p = 12.000 (x2) 8b + 2p = 24.000 -
= -3b = -7.500
= b = 2.500
= p = 2.000
jadi buku tulis = 2500
pensil = 2000
p = pensil
5b + 2p = 16500 |x4
4b + p = 12000 | x5
20b + 8p = 66000 -
20b + 5p = 60000
3p/3 = 6000/3
p = 2000
4b + p = 12000
4b + 2000 = 12000
4b = 12000 - 2000
4b = 10000/4 = 2500