Срочно!!! пожалуйста.

$\left \{ {x=5y} \atop {2x-7y=6}} \right. \left \{ {x=5y} \atop {2*5y-7y=6}} \right. \left \{ {x=5y} \atop {3y=6}} \right. \left \{ {x=5*2} \atop {y=2}} \right. \left \{ {x=10} \atop {y=2}} \right.$
Ответ: (2;10)
$\left \{ {y=2-3x} \atop {5x+4y=-6}} \right. \left \{ {{y=2-3x} \atop {5x+4*(2-3x)=-6}} \right. \left \{ {y=2-3x} \atop {5x-12x=-14}} \right. \left \{ {y=2-3x} \atop {-7x=-14}} \right. \left \{ {y=2-3*2} \atop {x=2}} \right. \left \{ {y=-4} \atop {x=2}} \right.$
Ответ: (2;-4)