A construction crew is lengthening a road. Let y represent the total length of the road (in miles). Let x represent the number of days the crew has worked. Suppose that x and y are related by the equation 3x+57 =y. Answer the questions below. No e that a change can be an increase or a decrease. For an increase, use a positive number. For a decrease, use a negative number. What was the road's length when the crew started working? miles What is the change per day in the road's length? miles