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y- cena bułki
x+5y=5,8
3x+8y=13,2
x=5,8-5y
3(5,8-5y)+8y=13,2
17,4-15y+8y=13,2
17,4-13,2=15y-8y
4,2=7y /:7
y=0,60
x=5,8-5*0,6
x=5,8-3
x=2,8
y=0,6
odp.Chleb kosztuje 2,80 zł, a bułka 0,60 zł.