What qualifies as an answer?
I reproduce my (deleted) answer here:
Use SFFT to factor $xy-8x-4y = 0$.
The answer received $2$ upvotes and was also accepted by the OP. A while later, however, a moderator converted the answer to a comment. In my opinion, the answer should have remained an answer because of the following reasons:
- Hints are allowed as answers on math.SE. Considering that my answer provided sufficient information to answer the question, it did not simply provide "minor or transient information" that would make it suitable as a comment.
- According to this meta post, an answer is one that provides some useful information even if you strip the markup. If one is aware of SFFT, stripping the markup still provides all necessary information to answer the question.
- Admittedly, the answer is short, but I do not think it lacks coherence or fails in accurately answering the question. IMO, adding additional information would merely detract from the clarity of the answer.
In light of the above, I'd like to understand what criterion my answer fails to meet that classifies it as a comment. Further, on a more general note, I'd appreciate it if one can make more distinct the line between answers and comments.