[tex] \bf \begin{cases}
\boxed{y}=x+4\\
y=-2x-2\\
---------\\
\boxed{x+4}=-2x-2
\end{cases}
\\\\\\
3x=-6\implies x=\cfrac{-6}{3}\implies x=-2
\\\\\\
\stackrel{\textit{if we plug that "x" in the first equation}}{y=(-2)+4\implies y=2}\qquad \qquad \qquad\qquad \qquad (\stackrel{x}{-2}~,~\stackrel{y}{2})[/tex]
