TOLONG BANTUU,PLEASE : Berat 8 sachet kopi instan dan 5 sachet biskuit 330 gram. berat 12 sachet kopi instan dan 6sachet biskuit 468. jika sebuah kantong plasti

8x + 5y = 330 |×3
12x + 6y = 468 |×2

24x + 15y = 990
24x + 12y = 936
………………………………… -
= 3y =54
y = 18

5(18) + 8x = 330
90 + 8x = 330
8x = 240
x = 30

jadi ,, 10x + 10y = 10(30) +10(18)
= 300 + 180
= 480 gram.