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y= tiket anak
2x+3y=19.000 (*2) -> 4x+6y=38000
x+2y=11.000 (*3) -> 3x+6y=33000 -
x = 5000 (6y sama sama dicoret)
terus masukin ke 4x+6y=38000
4(5000)+6y=38000
20000+6y=38000
6y=38.000-20.000
y=18000/6
y=3000 1 tiket dewasa = 5000
1 tiket anak = 3000
semoga membantu :)