Which equation describes the line that contains (1,5) and has a slope of 2? A. y= 2x - 3
B. y = 2x - 9
C. y = 2x + 9
D. y = 2x + 3

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?