Algebra sucks

Boom.

I have a unit test and I was trying to figure the last problem out, but I'm darn sure there isn't enough info.
SERIOUSLY!?
I SHOULD BE ABLE TO WRITE THREE OR MORE EQUATIONS NOT INCLUDING THE (aggghhh forgot what its calleddd) ONE EQUATION THAT YOU MULTIPLY ALL THE VERTICES OF THE FEASABLE REIGON TO TO FIGURE OUT THE MAXIMUM AND MINIMUM
*heavy breathing*

Algebra sucks.