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pensil = x
buku = 2 x pensil
Y= 2X
jika
6 buku + 15 pensil = Rp21.600,00
maka
6y + 15x = Rp21.600,00
substitusi nilai y ke atas
6 (2x) + 15 x = Rp21.600,00
12x + 15x = Rp21.600,00
27x = Rp21.600,00
x= Rp.800,00
harga 1 buku = 2 pensil
1 pensil harganya Rp800,00
maka 1 buku = 2 kali pensil
= 2 x Rp800,00
= Rp1.600,00
jadi harga 1 buku adalah Rp1.600,00