The first equation is
[tex]x-3y=-6[/tex]First, we subtract x from each side.
[tex]\begin{gathered} x-x-3y=-6-x \\ -3y=-6-x \end{gathered}[/tex]Then, we divide the equation by -3.
[tex]\begin{gathered} -\frac{3y}{-3}=\frac{-6-x}{-3} \\ y=2+\frac{x}{3} \end{gathered}[/tex]