Помогите, очень срочно

Решите задачу:

$\left \{ {{-x-y=0} \atop {xy=-16}} \right.\\\\\left \{ {{x=-y} \atop {-y*y=-16}} \right. \\\\\left \{ {{x=-y} \atop {y^{2}=16 }} \right.\\\\\left \{ {{x=-y} \atop {\left[\begin{array}{ccc}y_{1}=-4 \\y_{2} =4\end{array}\right}} \right.\\\\\\\left[\begin{array}{ccc}\left \{ {{x_{1} =4} \atop {y_{1} =-4}} \right. \\\left \{ {{x_{2} =-4} \atop {y_{2}=4 }} \right. \end{array}\right\\\\Otvet:\boxed{(4;-4),(-4;4)}$