Пожалуйста решите системы срочно!!!! Особенно нужны последние 2!!!!

[tex]xy + {x}^{2} = 10 \\ xy + {y}^{2} = 15 [/tex]

И последнее:

[tex]x + y + xy = - 19 \\ xy(x + y) = - 20[/tex]

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