A multiple regression equation with 2 independent variables has the following properties: For every unit increase in x 1 , y increases by 9.7 on average, holding x 2 constant. For every unit increase in x 2 , y decreases by 18.7 on average, holding x 1 constant. When x 1 = 0 and x 2 = 0, y = 35. Which of the following best represents the equation? y = 9.7 x 1 18.7 x 2 35 y = 35 + 9.7 x 1 + 18.7 x 2 y = 35 + 9.7 x 1 18.7 x 2 y = 35 9.7 x 1 18.7 x 2 y = 35 9.7 x 1 + 18.7 x 2