(1) As can be seen from the figure, the intersection point is (3000,2000), that is, Y is the same, that is, the expenses of the two companies are the same, and the corresponding X value is 3000Km.

(2)y 1 is an individual and y2 is a company. When x is greater than 3000, the value of y2 is always greater than y 1, which means it is economical to rent an individual.

(3) According to the answer to the second question, you can choose a car rental company.