$30k Cash: Pay down mortgage or use to invest?

[Cory Damon]

#askBP

I have $30k saved and ready to use.  Is there an advantage to using this to pay down my current (primary) mortgage and then getting an equity line of credit, or should I use this strictly as investment capital? 

The reason I ask is because... well I'm ignorant.  But also because I see the advantage of having an equity line of credit to pull funds as needed without having to go through an approval process each time.  So, I thought if I paid down my mortgage I would have more available to me through the line of credit.  

Thanks in advance for your insight and opinions.

Cory