A company that installs air conditioners has developed a linear model to predict the demand for air conditioners based on the outside temperature. Their line of best-fit is y' = 5+2.1x where x is the outside temperature in degrees Celsius. Interpret the y-intercept (b) for the line of best-fit. When the demand for air conditioners is 0, the outside temperature is 5C. O When the demand for air conditioners is 0, the outside temperature is 2.1C. When the outside temperature is 0C, the demand for air conditioners is 5. When the outside temperature is 0C, the demand for air conditioners is 2.1