### Making predictions based upon regression equation

For the multiple regression equation y-hat = 100 + 20x1 - 3x2 + 120x3 a. identify the y-intercept partial regression coefficients b. if x1 = 12, x2 = 5, and x3 = 10, what is the estimated value of y? c. if x3 were to increase by 4, what change would be necessary in x2 in order for the estimated value of y to remain unchange