A repair company charges a fixed amount plus an hourly rate for a service call. Suppose it charges $173 for a one-hour call and $241 for a five-hour call. Find a linear function that describes the price of a service call in terms of x, the number of hours.
a. (x) = 25x + 148
b. (x) = 20x + 153
c. (x) = 35x + 128
d. (x) = 30x + 163