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x+18 - bilet normalny
x+x+18=48
2x+18=48
2x=30
x=15 - bilet ulgowy
x+18=15+18=33 - bilet normalny
y-cena biletu ulgowego
x+y=48
y=x+18
x+x+18=48/-18
y=x+18
2x=30/:2
y=x+18
x=15
y=15+18
x=15
y=33
x- bilet ulgowy
y- bilet normalny
x+y=48
y=x+18
x+x+18=48/-18
y=x+18
2x=30/:2
y=x+18
x=15
y=15+18
x=15
y=33