(BRAIN BUSTER) Your portable stereo requires 10 size....?

D batteries. You have $25 to spend on 5 packages of 2 batteries each and would like to maximize your battery power. Each regular package of batteries costs $4.25 and each alkaline package of batteries costs $5.50 (because alkaline batteries last longer). How many packages of each type of battery should you buy? Use a verbal model to write and solve a system of linear equations!