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y- batonik
{4x+4y=12
{2x+6y=9,20
4x=12-4y| :4
x=3-y
2x+6y=9,20
2* (3-y) +6y= 9,20
6- 2y + 6y= 9.20
4y= 9,20- 6
4y=3,20|:4
y=0,80
x=3-y
x= 3-0,80
x=2,20
{x=2,20
{y=0,80
2,20-0,80=1,40
Odp. Droższa jest czekolada. O 1,40 zł.