Question

прошу помогите,мне очень срочноx+y=10
x-y=2

Answer 1

$\left \{ {{x+y=10} \atop {x-y=2}} \right. \\\left \{ {{x+y=10} \atop {x=y+2}} \right. \\\left \{ {{y+2+y=10} \atop{x=y+2}} \right.\\\left \{ {{2y+2=10} \atop {x=y+2}} \right. \\\left \{ {{2y=8} \atop {x=y+2}} \right. \\\left \{ {{y=4} \atop {x=y+2}} \right. \\\left \{ {{y=4} \atop {x=4+2}} \right. \\\left \{ {{y=4} \atop {x=6}} \right.$

Пошаговое объяснение: