Can I hide one of my KudoZ answers and submit a new one?

Posting multiple answers in a systematic way is against KudoZ rule #3.3 (hidden answers are included in this count).

Hiding an answer with disagrees and re-posting the same answer (thus "cleaning" the negative peer comments) would be out of line with general site rule #2.

Hiding a wrong answer (even with disagrees) and posting a different one is valid, provided it is not done in a systematic way.