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x^2+y^2=65
x=11-y
(11-y)^2+y^2=65
121-22y+y^2+y^2065
2y^2-22y+56=0
hacemos la ecuacion de 2º grado
y no da 7 y 4
4·4=16 ; 7·7=49 ; 16+49=65