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pensil =1500
5 buku + 2 pensil = 5(2500) + 2(1500) = 15.500 (D)
pensil = P
4B + 2P = 13000 ⇒ x 3 ⇒ 12B + 6P = 39000
3B + 1P = 9000 ⇒ x 4 ⇒ 12B + 4P = 36000 _
0 + 2P = 3000
P = 3000
2
P = 1500
jadi,harga pensil = 1500
lalu cari harga buku ⇒ ambil dari salah satu perjumlahan harga di atas.misalnya;
4B + 2P = 13000
4B + 2(1500) = 13000
4B + 3000 = 13000
4B = 13000-3000
4B = 10000
B= 2500
jadi,harga buku = 2500
DITANYA?
5 buku tulis tambah 2 pensil =
5B + 2P ⇒ 5 ( 2500 ) + 2 ( 1500 )
= 12.500 + 3000 = 15.500
jawabnya D