Решить систему уравнений фигурная скобка х в квадрате -ув квадрате=40 ниже х-у=5

[latex] \left \{ {{x^2-y^2=40} \atop {x-y=5}} \right. [/latex] ; [latex] \left \{ {{x^2-y^2=40} \atop {x=y+5}} \right. [/latex] ; [latex] \left \{ {{(y+5)^2-y^2=40} \atop {x=y+5}} \right. [/latex] ; [latex] \left \{ {{y^2+10y+25-y^2=40} \atop {x=y+5}} \right. [/latex] ; [latex] \left \{ {{10y=15} \atop {x=y+5}} \right. [/latex] ; [latex] \left \{ {{y=1,5} \atop {x=1,5+5}} \right. [/latex] ; [latex] \left \{ {{y=1,5} \atop {x=6,5}} \right. [/latex]