Pamela:
Yes, I would try this:
#1. Spray the bolts with PD Blaster, a solvent to loosen items, found at Home Depot, Ace, etc.
#2. Let this set in for maybe 30 minutes.
#3. Place your screw driver or wrench on the bolt, apply some pressure, BUT, tap on the tool with a hammer as you apply pressure, this will send vibrations into the bolt and it will help to loosen the bolt.
#4. Keep pressure on towards loosening and keep tapping with a hammer until they break free.
This has worked well for me.
Hayden