Question

Пожалуйста помогти те

Answer 1

$\displaystyle \left \{ {{2x+3y=11} \atop {x+y=4}} \right.\\ \\\left \{ {{2x+3y=11} \atop {x=4-y}} \right.\\ \\\2(4-y)+3y=11\\y=3\\x=4-3\\x=1\\(x,y)=(1,3)$