Different hotels in a certain area are randomly selected, and their ratings and prices were obtained online. Using technology, with x representing the ratings and y representing price, we find that the regression equation has a slope of 135 and a y-intercept of - 390. Complete parts (a) and (b) below. a. What is the equation of the regression line? Select the correct choice below and fill in the answer boxes to complete your choice. O A. y= +() x O B. y=+ ( ) x O c. y= + ( ) * OD. y = + ( ) x b. What does the symbol y represent? O A. The symbol y represents the average price of hotels in the area O B. The symbol y represents the amount that price increases with a 1-point increase in rating. O C. The symbol y represents the predicted value of price. O D. The symbol y represents the expected price when the hotel's rating is 0