ashley and kim are selling cheesecakes for a school fundraiser. customers can buy new york style cheesecakes and apple cheesecakes. ashley sold 8 new york style cheesecakes and 11 apple cheesecakes for a total of "$261." find the cost of each one new york style cheesecake and one apple cheesecake.

8n + 11a = 261

find the values for n and a