Harga 9 buku sama dgn harga 14 pensil.harga 3 pensil sama dgn harga 7 penghapus. Beli 5 buku harga 10.625, harga 2 buku, 4 pensil, 3 penghapus adalah

misal:
buku = x
pensil = y
penghapus = z

9x = 15y

3y = 5z

5x = 10625
x = 10625/5
x = 2125

9x = 15y
9(2125) = 15y
19125 = 15y
19125/15 = y
1275 = y

3y = 5z
3(1275) = 5z
3825 = 5z
3825/5 = z
765 = z

2x + 4y + 3z
= 2(2125) + 4(1275) + 3(765)
= 4250 + 5100 + 2295
= 11645