A corporation owns several companies. The strategic planner for the corporation believes dollars spent on advertising can to some extent be a predictor of total sales dollars. As an aid in long-term planning, she gathers the following sales and advertising information from several of the companies for 2009 ($ millions).

Advertising Sales

12.5 ..............148

3.7 .............. 55

21.6 ..............338

60.0 ..............994

37.6 ..............541

6.1 .............. 89

16.8 ..............126

41.2 ..............379

Develop the equation of the simple regression line to predict sales from advertising expenditures using these data.