An engineer wants to determine how the weight of a? gas-powered car,? x, affects gas? mileage, y. The accompanying data represent the weights of various domestic cars and their miles per gallon in the city for the most recent model year. Complete parts? (a) Weight (pounds), x Miles per Gallon, y 3797 16 3894 15 2687 26 3532 19 3228 21 2894 22 3636 17 2694 25 3444 18 3772 16 3279 19 ?(a) Find the? least-squares regression line treating weight as the explanatory variable and miles per gallon as the response variable. ^y=X + _