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y-cena bułki
6y+x=4.80
6x+y=11.30
x=4.80-6y
6(4.80-6y)+y=11.30
x=4.80-6y
28.80-25y=11.30
x=4.80-6y
17.50=25y
x=4.80-6y
y=0.7
y=0.70zł
x=0.60zł
s - cena serka
6b+s = 4,8
b+6s = 11,3
s = 4,8-6b
b+6(4,8-6b) = 11,3
s = 4,8-6b
b+28,8-36b = 11,3
s = 4,8-6b
-35b = 11,3-28,8
s = 4,8-6b
-35b = -17,5 |:(-35)
s = 4,8-6b
b = 0,5
s = 4,8-6*0,5 = 4,8-3 = 1,8