What is the domain of the multivariable function f(x,y)=1x−yf(x,y) = \frac{1}{x-y}f(x,y)=x−y1?
All points in the xyxyxy-plane except where y=xy = xy=x
All points in the xyxyxy-plane except (0,0)(0,0)(0,0)
All points where x>yx > yx>y
All points where y>xy > xy>x