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y - bilet normalny
y=x+4
2x+y=40
y=x+4
2x+x+4=40
y=x+4
3x=36
y=x+4
x=12
y=12+4 = 16
Odp. Bilet normalny kosztuje 16zł, bilet ulgowy 12zł.
y-ulgowy
x+2y=40
4+y=x
x+2y=40
y-x=-4
^^^^^^^^
3y=36/:3
y=12
x+2*12=40
x=40-24
x=16
y=12
x=16