Question

Помогите пожалуйста 4 задание. Срочно

Answer 1

Ответ:

$\left \{ {{y=2-x} \atop {2x+y=5}} \right.\\\\\left \{ {{y=2-x} \atop {2x+2-x=5}} \right. \\\\\left \{ {{y=2-x} \atop {x+2=5}} \right. \\\\\left \{ {{y=2-x} \atop {x=5-2}} \right.\\\\\left \{ {{y=2-3} \atop {x=3}} \right. \\\\\left \{ {{y=-1} \atop {x=3}} \right.$