Solution:
Given the set below;
[tex](x,y);y=\sqrt{x-3}[/tex]Using a graphing tool, the graph of the function is shown below;
From the graph above,
The domain of the function is from 3 and it tends to infinity, i.e.
[tex]x\ge \:3\:[/tex]Hence, the domain of the set is
[tex]\lbrace x|x\ge3\rbrace[/tex]