Diana is a homebound teacher who charges $45 per hour plus an additional flat fee of $20 for travel. the equation that represents this situation is y = 45x + 20, where x represents the number of hours of classes and y represents the total cost. another teacher, paula, creates a graph comparing the total amount diana charges for a session and the total amount she charges for a session. paula finds her graph is shifted below diana's line, and her line is also steeper than diana's line. select the true statement. a: paula charges less per hour and has a lower travel fee. b: paula charges more per hour but has a lower travel fee. c: paula charges less per hour but has a higher travel fee. d: paula charges more per hour and has a higher travel fee.