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pensil = p
buku = b
bella : 2 b + 1 p= 5000 |×3| => 6b + 3p = 15.000
ahmad : 3 b + 4 p = 10500 |×2| => 6b + 8p = 21.000 -
-5p = -6000
p = - 6000 : -5 = 1200
jadi harga pensil Rp. 1200
kalo harga buku
2b + 1p = 5000
2b + 1(1200) = 5000
2b + 1200 = 5000
2b = 5000 - 1200
2b = 3800
b = 3800 : 2 = Rp.1900