State the practical meaning of the slope and y-intercept for the situation described. the cost, in dollars, of retaining the services of a computer repairman in anchorville is given by c = 48x + 18, where x is the number of hours worked. a. 48 signifies the hourly rate, and 18 signifies the overhead charge. c. 18 signifies the hourly rate, and 48 signifies the overhead charge. b. -48 signifies the hourly rate, and 18 signifies the travel cost.