harga 6kg jeruk setara dengan harga 5kg apel. harga 4kg jeruk dan 3kg apel Rp114.000 jika bu Aning membeli 1kg jeruk dan 2kg apel, ia harus membayar sebesar...

x = harga jeruk
y = harga apel

6x = 5y
x = 5/6 y

4x + 3y = 114000
4(5/6 y) + 3y = 114000
20/6y + 3y = 114000
20/6 y + 18/6 y = 114000
20y + 18 y = 114000 x 6
38 y = 684000
y = 684000/38
y = 18000

6x = 5y
6x = 5 x 18000
6x = 90000
x =90000/6
x = 15000

1 kg jeruk = 15000
2 kg apel = 2 x 18000 = 36000

yg harus di bayar ibu aning = 15000+36000 = 51000