The temperature 100 ft below sea level is 36°F. The temperature at sea level is 56°F. The temperature drops 5°F every 1,000 ft above sea level. Let x be the distance above sea level in thousands of feet. Let y be the temperature. Express the relationship between x and y with an equation. Is the relationship between x and y proportional? What is the temperature 5,000 ft above sea level? What given information did you not use to solve this problem?