Example 2, the prediction equation between y = selling price and x1 = house size and x2 = number of bedrooms was y? = 60,102 + 63.0x1 + 15,170x2.
a. For a fixed number of bedrooms, how much is the house selling price predicted to increase for each square foot increase in house size? Why?
b. For a fixed house size of 2000 square feet, how does the predicted selling price change for two, three, and four bedrooms?