Решите,пожалуйста.Подробно.

1.[tex] \left \{ {{6x-y=2} \atop {-x+y=-1}} \right. [/tex]

2.[tex] \left \{ {{x+y=-5} \atop {-y- x^{2} =5}} \right. [/tex]

3.[tex] \left \{ {{x-y=6} \atop { x^{2} + y^{2} =20}} \right. [/tex]
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