Which of these is a non-linear transformation?
T(x,y)=(x+1,y+1)T(x,y) = (x+1, y+1)T(x,y)=(x+1,y+1)
T(x,y)=(2x,3y)T(x,y) = (2x, 3y)T(x,y)=(2x,3y)
T(x,y)=(x2,y)T(x,y) = (x^2, y)T(x,y)=(x2,y)
T(x,y)=(−y,x)T(x,y) = (-y, x)T(x,y)=(−y,x)