Determine a region of the xyx_(0),y_(0) (y-x)y^(')=y+x
There is a unique solution in any region where x=0.
There is a unique solution in any region where x=y.
There is a unique solution in the entire xy-plane.
There is a unique solution in the xy-plane except at the origin.
There is a unique solution in any region where y>xy or where y>x.