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2.700:3=900
harga buku tulis rp.2.700
harga penggaris rp.900
Y= penggaris
2X+3Y=5.400 ....... (1)
3X+4Y=7.700........ (2)
jadi,
2X+3Y=5.400| dikali 3
3X+4Y=7.700| dikali 2
--------------------------------
6X+9Y=16.200
6X+8Y=15.400
----------------------------
Y=800
jadi, harga penggaris adalah Rp800