Self-Travel, a car rental firm, has two methods of charging for car rental:

Method 1 $64 per day + 25 cents per kilometre

Method 2 $89 per day with unlimited travel

a Write a rule for each method if C1 is the cost, in dollars, using method 1 for x kilometres travelled, and C2 is the cost using method 2.

b Draw a graph of each rule on the same axes.

c Determine, from the graph, the distance which must be travelled per day if method 2 is cheaper than method 1.