Determine the set of points at which the function is continuous.

F$($x$,$y$)=$ arctan$($x$5+$

y

$)$

D$=\{($x$,$y$)|$y$[0,$$),$x$\}$

D$=\{($x$,$y$)|$y$0\}$

$$

F$$is continuous on$$

D$=\{($x$,$y$)|$y$,$x$[0,$$)\}$

D$=\{($x$,$y$)|$x$5\}$