I have a multi-function printer, can I send a fax with it using my reg. phone line, not a dedicated fax line?

You can use your nirmal phone line to send a fax with out any problems.

Having a speedboat in your backyard doesn't allow you to sail to the Mediterranean for the same reason that your multi-function printer does not allow you to send faxes. You need an account with an Internet provider that allows you the fax option. You also need a computer with a fax program and hopefully the tutorial that guides you through the process. Those things you can find by either checking on the home page for the fax company or just clicking on Yahoo.com and putting in your search words. Boaz.

yes, there is no special line for faxing

Yes...phone line goes to the Fax/Printer first and another line from the fax to your regular phone.