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Pensil = y
2x + 3y = 23000 x2
5x + 2y = 41000 x3
4x + 6y = 46000
15x + 6y = 123000
______________ _
- 11x = - 77000
x = 7000
2x + 3y =23000 x5
5x + 2y = 41000 x2
10x + 15y =115000
10x + 4y = 82000
______________ _
11y = 33000
y = 3000
Jadi harga 1 buku =7000
harga 1 pensil =3000
Maka,
Harga 17 buku + 23 pensil
= 17( 7000) + 23 ( 3000)
= 119000+ 69000
= 188000
Jadi harga 17 buku + 23 pensil adalah Rp.188.000