A sample of nitrogen gas in a 750mL vessel at 40c and 200 Torr..?

A Sample of nitrogen gas in a 750mL vessel @40 C and 200 Torr. If the vessel (volume is held constant) is warmed to 50 C what is the resulting pressure? - How would I go about figuring this out?

Also, I have a similar problem which is:

A sample of Nitrogen gas in a 750mL vessel at 40 C and 200 Torr. If the vessel is expanded to 825mL (at constant temperature), what is the resulting pressure?

I was shown how to do these problems with an example, which covered both V change and T change. I cannot figure out how to do the problem with just one of them and not both..

I hope this question isnt too confusing, and I greatly appreciate any help I can get! Thank you so much :)