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x bilety ulgowe
y bilety normalne
3x+5y=84 //*-5
5x+3y=76 //*3
-15x-25y=-420
15x+9y=228
-16y=-192
y=12
x=(84-5y)/3
x=(84-60)/3
x=24/3
x=8
bilet ulgowy kosztował 8 zł , a normalny 12 zł
y - cena biletu normalnego
{3x+5y = 84
{5x+3y = 76
{x = 28-5y/3
{5(28-5y/3) + 3y = 76
{x = 28-5y/3
{140-25y/3 + 3y = 76
{x = 28-5y/3
{-16y/3 = -64
{x = 28-5y/3
{y = 12
{x = 8
{y = 12
Odp. Bilet ulgowy kosztował 8 zł, a normalny 12 zł.
bilet normalny= 11,50zł