Answer :
[tex]x-5y=19\ \ \ | subtract\ x\\\\
-5y=19-x\ \ \ | divide\ by\ -5\\\\
y=\frac{x-19}{5}\\\\
Solution\ is \ y=\frac{x-19}{5}.[/tex]
[tex]x-5y=19 \\\\ -5y=19-x \\\\ \boxed{y=\frac{x-19}{5}}[/tex]