A package delivery service uses a regression equation to estimate the fuel costs of its trucks based on the number of miles driven. The equation is of the form Estimated Dollars  Miles. If gasoline...

A package delivery service uses a regression equation to estimate the fuel costs of its trucks based on the number of miles driven. The equation is of the form Estimated Dollars
 Miles. If gasoline prices go up, how would you expect the fit of this equation to change?

A customized milling operation uses the equation
200 plus
150 per hour to give price estimates to customers. If it pays a fixed fee to ship these orders, how should it change this equation if the cost of shipping goes up?