Question

Помогите пожалуйста а то мне хана

Answer 1

$2)\\+\left \{ {{x-y=2} \atop {x+y=7}} \right.\\-------\\2x=9\\\\x=4,5\\\\y=7-x=7-4,5=2,5\\\\Otvet:\boxed{(4,5 \ ; \ 2,5)}\\\\\\3)\left \{ {{2x+3y=5} \atop {x=2-y}} \right.\\\\\left \{ {{2(2-y)+3y=5} \atop {x=2-y}} \right.\\\\\left \{ {{4-2y+3y=5} \atop {x=2-y}} \right.\\\\\left \{ {{y=5-4} \atop {x=2-y}} \right.\\\\\left \{ {{y=1} \atop {x=2-1=1}} \right. \\\\Otvet:\boxed{(1 \ ; \ 1)}$