Given the following multiple regression equation: y = 59 + 15x1 - 12x2 Select the direction of change in y and enter a positive integer in the answer box. a) If 1 increases by 1 unit while holding x2 constant, then y [Select an answer ] by units on average. b) If 2 increases by 1 unit while holding 1 constant, then y (Select an answer v ] by units on average. Check