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f(x,y)=sqrt(y-x) Find the boundary of the function's domain.

Mathematics
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what have you tried so far?
I know it has something to do with interior points and boundary points, but I dont get it. My current understanding is that interior points are arbitrary points in the function's range that if we make them the center of a disk with positive radius, all the points in that disk are also in R. Then boundary points are the same except that the disk has some points inside R and some outside R. --- This doesnt make sense to me because wouldn't it depend on how big the radius of the disk is? how do you know how big the radius is?
Okay, so you have,\[\large f(x, y) = \sqrt{y-x}\] and you want to try and find the boundary of the domain. So, you want to find out when this function is valid. So when is it? Well, we know that for the square root of anything, that anything must be greater to or equal to zero so we have,\[y - x \ge 0\] so,\[y \ge x\]

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Other answers:

yeah, I've gotten that so far.
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that is where the function would be valid, whcih means that the boundary of the func's domain would be the line y=x
so basically it's just graphing the domain inequality.
Seems to be that way, yes

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