Question

Помогите Пж!!!!!!!!!!​

Answer 1

$\displaystyle \left \{ {{7x-5y=9} \atop {-x+y=1}} \right. \to \left \{ {{7x-5y=9} \atop {y=1+x}} \right.$

$7x-5\cdot(1+x)=9\\7x-5-5x=9\\7x-5x=9+5\\2x=14\\x=14\div2\\x=7$

$y=1+7\\y=8$

ОТВЕТ:  (7; 8)