Now does that make conceptual sense if we actually try to visualize these functions? So let me draw, let me actually try to graph these functions. So that's my y-axis, this is my x-axis. And let me graph y equals x. So y is equal to f of x here, so y is equal to x. So it looks something like that. So y is equal to x, or this is f of x equals to x, or y is equal to this f of x right over there.