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5x + 4y = 3.300 <- di kali 2= 10x+8y = 6.600
10x+ 8y = 6.600
10x + 2y = 5.400 -
6y = 1.200
y = 200
5x + 4(200) = 3.300
5x = 3.300-800
5x = 2.500
x = 500
jadi, harga 1 buku adalah Rp. 500 dan harga 1 pensil adalah Rp. 200
10x +2y= 5.400...(1)
5x+4y= 3.300.......(2)
x dan y?
pers.2 kita seserhanakan : 5x+y=2.700
lalu eliminasi
5x+ y= 2.700
5x+4y= 3.300 -
-3y= -600
y= 200
x= 500