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b-bruliony
{a+b=32
a-b=-4
a=14
b=18
a-cena zeszytu
b-cena brulionu
5a+2b=13
5×1,1a+2×0,9b=13,50
5a+2b=13
5,5a+1,8b=13,50
5a=13-2b / :5
a=(13-2b):5
5,5×(13-2b):5+1,8b=13,50
14,3-2,2b+1,8b=13,50
-0,4b= -0,8
b=2
a=(13-2b):5
a=(13-2×2):5
a= 9:5
a=1,8
b=2
b=2