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y=obecny wiek mamy
4(x-4)=y-4
10(x-10)=y-10
4x-16=y-4
10x-100=y-10
y=4x-12
10x=100+4x-12-10
10x-4x=78
6x=78
x=78:6
x=13 lat ma autor wypowiedzi
y - lata mamy
4(x-4)=y-4
10(x-10)=y-10
4x-16=y-4
10x-100=y-10
4x-y=12|*(-1)
10x-y=90
-4x+y=-12
10x-y=90
----------------
6x=78
x=13
odp: Autor wypowiedzi ma 13 lat.