Question

PLEASE I NEED HELP

Answer 1

$\bf \begin{cases} x-2y=-7\\ x-y=9\implies \boxed{x}=9+y \end{cases} \\\\\\ \stackrel{\textit{substituting \underline{x} in the first equation}}{\boxed{9+y}-2y=-7}\implies -y=-16 \\\\\\ y=\cfrac{-16}{-1}\implies y=16\\\\ -------------------------------\\\\ \stackrel{\textit{and substituting \underline{y} in the first equation}}{x-2(16)=-7}\implies x-32=-7\implies x=25 \\\\\\ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~(\stackrel{x}{25}~~,~~\stackrel{y}{16})$