ali membeli 10 roti keju dan 12 riti kismisdengan harga Rp20.900 sdngkan ana membeli 6 roti keju dan 5 roti kismis dengan harga Rp11.000 tentukan harga yg harus

10x + 12y = 20,900 x6
6x + 5y = 11,000 x10

60x + 72y = 125,400
60x + 50y = 111,000
-------------------------------- -
22y = 14,400
y = 655.5

6x + 5y = 11,000
6x + 5(655.5) = 11,000
6x + 3,277.5 = 11,000
6x = 7,722.5
x = 1,287

2 roti keju
= 2 x 1,287
= Rp 2,575

2 roti kismis
= 2 x 655
= 1,310

Total yang harus dibayar
= Rp 2,575 + Rp 1,310
= Rp 3,885


Maaf kalau benar ya kak...
Let's math every^DAMN^day!
[DAMNATION]™