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penggaris = y
maka bisa di buat persamaan:
4x + 10y = 23000 : (2)
10 x + 4y = 26000 : (2)
2x + 5y = 11500 x 5
5x + 2y = 13000 x 2 -
21y = 31500
y = 1500 jadi penggaris = Rp.1500
2x + 5y = 11500 x 2
5x + 2y = 13000 x 5 -
21x = 42000
x = 2000 jadi harga buku = Rp 2000
maka harga 7 buku dan 3 penggaris adalah
7(2000) + 3(1500) = Rp. 18.500