Problem 8 [Linear Function] What is the area of the triangle determined by the lines 31 = ix + 5, y = 6x and the y-axis? Problem 9 [Linear Function] A company rents cars at $40 a day and 15 cents a mile. Its competitor's cars are $50 a day and 10 cents a mile. (a) For each company. give a formula for the cost of renting a car for a day as a function of the distance traveled. (b) On the same axes, graph both finictions. (c) How should you decide which company is cheaper