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y - wiek Ewy
x+y = 55
x-y = 3y
x+y = 55
x-4y=0 / * (-1)
5y = 55
y=11
x+11=55
x=44
Odpowiedź. Krystyna ma 44 lataaa Ewa ma 11 lat.
y - wiek Ewy
(x+y = 55
(x-y = 3y
(x+y = 55
(x=4y
(4y+y=55
(x=4y
(5y=55/5
(x-=4y
(y=11
(x=44