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x - 5 -bilet ulgowy
41 - cena trzech biletów w tym 2 ulgowych
x + 2(x - 5) = 41
x + 2x - 10 = 41
3x = 51
x = 17 zł normalny bilet
17 - 5 = 12 zł ulgowy bilet
ALBO
x - bilet normalny
y - bilet ulgowy
/x + 2y = 41
\x = y +5
/y +5 + 2y =41
\x = y + 5
/3 y = 36
\ x = y + 5
/ y = 12
\ x = 12 +5 = 17
/y =12
\ x =17
y - bilet ulgowy
x + 2y = 41
x = y +5
y +5 + 2y =41
x = y + 5
3 y = 36
x = y + 5
y = 12
x = 12 +5 = 17
y =12
x =17