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y - cena biletu ulgowego
3x+2y=34
x+3y=23 /*(-3)
3x+2y=34
-3x-9y=-69
__________
-7y=-35 /:(-7)
y=5
y=5
x+3*5=23
y=5
x=23-15
y=5
x=8
Odp. Bilet normalny kosztuje 8 zł, a ulgowy 5 zł.
x+3y=23 => x=23-3y
3(23-3y)+2y=69-7x=34
-7y=-35 => y=5
x=23-15=8