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17y+15x=4870
10×+9y=2990
×=2990-9y÷10
17y+15×=4870
×=4870-17y÷15
2990-9y ÷10=4870-17y÷15
15(2990-9y)=10(4870-17y)
44850-135y=48700-170y
35y=3850
y=110
reemplazamos
10×+9y=2990
10×+9(110)=2990
10×+990=2990
10×=2990-990
10×=2000
×=2000/10
×=200
respuesta.- la entrada de adulto cuesta 200 y la de un niño cuesta 110