At What Points Is the Given Function Continuous?
- $$f ( x , y ) = \frac { x y } { x + y }$$

Multiple Choice

At what points is the given function continuous?
- $$f ( x , y ) = \frac { x y } { x + y }$$

A) All $( x , y )$ such that $x \neq y$
B) All $( x , y ) \neq ( 0,0 )$
C) All $( x , y )$
D) All $( x , y )$ such that $x \neq - y$