Помогите решить систему: x-y=-5 x^2-2xy-y^2=17

[latex] left { {{x-y=-5} atop {x^2-2xy-y^2=17}} ight. \ left { {{x=y-5} atop {x^2-2xy+y^2-2y^2=17}} ight. \ left { {{x=y-5} atop {(x-y)^2-2y^2=17}} ight. \ (y-5-y)^2-2y^2=17 \ 25-17=2y^2 \ y^2=8/2=4 \ y=2; -2 \ x=y-5=2-5=-3;-2-5=-7[/latex]отв:(-3;2); (-7;-2)