A soda vendor at Aloha Stadium noticed that during Rainbow Warrior football games that more soda is being served the warmer the temperature during...

A soda vendor at Aloha Stadium noticed that during Rainbow Warrior football games that more soda is being served the warmer the temperature during game time. Based on 40 home games covering the past 5 years, the vendor estimates the relationship between soda sales and game time temperature to be ŷ = -240 + 8x, where ŷ = the number of sodas sold during the game and

 x = the temperature during game time in degrees Fahrenheit. 

1. On a day when the temperature at game time is forecast to be 80°F, predict how many sodas the vendor will sell.
2. Below what temperature are the expected sales to be 0?