I just finished writing an article for Hubpages.com. Question is- can I include a relevant backlink to my blog?
Unique content without any advertisement get published on Hubpages well as Wikipedia to get Do follow backlinks from that.
Of course you can, but I'd be doubly wary about doing so. Hubpages is governed and moderated with an iron hand, and each unscrupulous link is a ground for account deletion. That website sucks and is filled with spam nowadays, so I wouldn't recommend using it now. (Sorry, being bitter here as I was banned for no good reason a year ago).
Yes you can its the part of your responsibility as a writer of content to deliver great content and inner page that guides the user to learn more in-depth with the related article. Focus on that and quality backlinks will follow.