Save You More offers a buy one/get one free item each week. Customers who purchase only one of the item must pay the regular price. The limit is one deal per customer. Is the relation (# sale items purchased, price) a function? Why or why not?

A function is for every input, you get 1 output

so sale items purchased to cost

if bought 1 then paid c (original cost)

if bought 2 then paid c (buy 1 get one)

so it is a functinon because it is only not a function if

bought x and pay y or z, can only be 1

so it is a functnion