[tex]\begin{gathered} 13x-6y=22\ldots\ldots(1) \\ x=y+6\ldots.\mathrm{\cdot}.(2) \\ \text{Substitute equation (2) into equation (1).} \\ 13(y+6)-6y=22 \\ 13y+78-6y=22 \\ 7y+78=22 \\ 7y=22-78 \\ 7y=-56 \\ y=-8 \\ Now,\text{ from equation (2)} \\ x=-8+6 \\ x=-2 \end{gathered}[/tex]
