The manager at a local Best Buy store kept track of daily sales of the iPhone 6 when it was first introduced.He noticed that sales were very high at first, but showed a steady decrease.For example, on day 5 after the phones first went on sale, the store sold 238 iPhone 6s, but on day 10 after the phones first went on sale, the store sold only 153 iPhone 6s.Assume that the relationship between number of days since the phone became available and number sold is linear and, let x = the number of days since the phone was released and y = number of phones sold at this Best Buy store.