How do you find the range of f(x,y)=ln(x+y-3)?

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How do you find the range of f(x,y)=ln(x+y-3)?

Mathematics
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The range depicts all possible values for f(x,y). I can't really tell you the range without knowing the domain.
the domain i got was \[x+y>3\]
The range should be -inf to inf.

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how can you tell?
ln of a number between 0 and e gives you a negative number. Between the range e to infinity, it gives you a positive number. etc. Does that help?
Kind of...is there any way to prove this algebraically?
Yes. The limit as x approaches 0 of ln(x) = -infinity. The limit as x approaches 1 of ln(x) is 0. The limit as x approaches infinity of ln(x) is infinity.

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