Ani membeli 2 buku tulis dan 5 pensil seharga65000 sedangkan ana membeli 4 buku tulis dan3 pensil seharga 95000 harga 2 buku tulis dan 4 pensil adalah?
a.45000 b.50000 c.55000 d.60000
ataSHKJ
2 buku + 5 pensil = 65000 | x 2 4 buku + 3 pensil = 95000 | x 1 _________________________ 4 buku + 10 pensil=130000 4 buku + 3 pensil = 95000 ______________________ - 7 pensil = 35000 pensil = 5000
2 buku + 5 pensil = 65000 2 buku + 5 (5000) = 65000 2 buku = 40000 buku = 20000
4 buku + 3 pensil = 95000 | x 1
_________________________
4 buku + 10 pensil=130000
4 buku + 3 pensil = 95000
______________________ -
7 pensil = 35000
pensil = 5000
2 buku + 5 pensil = 65000
2 buku + 5 (5000) = 65000
2 buku = 40000
buku = 20000
2 buku + 4 pensil =
2(20000) + 4(5000) =
Rp60000,- (d)
buku tulis=×
pensil=y
2×+5y=65000
4x+3y=95000
dieliminasi
×2| 4×+10y=130000
×1| 4×+3y = 95000 -
7y = 35000
y = 35000/7
y = 5000
2×+5y =65000
2×+5 (5000) =65000
2×+25000 =65000
2× =65000-25000
2× =40000
× =40000/2
× =20000
1 buku tulis=20000
1 pensil = 5000
jadi
2×+4y= 2(20000) + 4(5000)
= 40000 + 20000
= 60000
jawaban d.60000