Di toko buku Murah , Adi membeli 4 buku, 2 bolpoin, dan 3 pensil dengan harga Rp26.000,00. Bima membeli 3 buku, 3 bolpoin,dan 1 pensil dengan harga Rp21.500,00. Citra membeli 3 buku dan 1 pensil dengan harga Rp12.500,00. Jika dina membeli 2 bolpoin dan 2 pensil, ia harus membayar ....
buku=3500
bolpoin=3000
jadi 2(3000)+2(2000)=6000+4000
= 10000
4bk+2b+3p=26000
3bk+3b+p=21500
3bk+p=12500
2b+p=?
jawab:
(3bk+3b+p=21500)-(3bk+p=12500)=
3b=9000
b=3000
(4bk+2b+3p=26000)-(3bk+3b+p=21500)=
make eliminasi,
(4bk+2b+3p=26000)3 -(3bk+3b+p=21500)2=
(12 bk+6b+9p=78000)-(6bk+6b+2p=43000)=
6bk+7p =35000
6bk+7p =35000 dieleminasi dengan 3bk+p=12500
(6bk+7p =35000) 1-(3bk+p=12500)2 =
(6bk+7p=35000)-(6bk+2p=25000) =
5p=1000
p=2000
2b+2p =2(3000)+2(2000)
=6000+4000
=10000