9. Analysis of your past parties has led to the development of a chip index: NZP where N is the number of nacho chip bags that you have and P is the number of potato chip bags that you have. Given that you have $18 for your Chip fund and a bag of nacho Chips costs $3 and a bag of potato Chips costs $1, how many bags of each chip should you buy to maximize the chip index and thus have a most awesome party