Рещите систему урпвнений {х-у=3 х^2+у^2=25-2ху

\left \{ {{x-y=3} \atop {x^{2} + y^{2} = 25 - 2xy }} \right. ; \left \{ {{x-y=3} \atop { x^{2} + 2xy + y^{2} = 25 }} \right. ; \left \{ {{x-y=3} \atop {(x+y)^{2}=25 }} \right. ; \left \{ {{x-y=3} \atop { (x+y)^{2} - 5^{2} = 0}} \right. ;  \left \{ {{x-y=3} \atop {(x+y-5)(x+y+5)=0}} \right. ; \left \{ {{x=y+3} \atop {(y+3+y-5)(y+3+y+5)=0}} \right. ; \left \{ {{x=y+3} \atop {(2y-2)(2y+8)=0}} \right. ;  \left \{ {{x=y+3} \atop {y= \left \{ {{1} \atop {-4}} \right. }} \right. ; \left \{ {{x= \left \{ {{4} \atop {-1}} \right. } \atop {y= \left \{ {{1} \atop {-4}} \right. }} \right.