If a car rental company charges $13 a day and 11 
a mile to rent one of its cars, then the cost z , in dollars, to rent a car for x days and drive y miles can be found from the equation: 
A second company charges $19 a day and 8 
a mile for the same car. The equation that gives the cost z , in dollars, to rent a car from this company for x days and drive it y miles can be found from the equation: 
A car is rented from each of the companies for 4 days. To find the mileage at which the cost of renting the cars from each of the two companies will be equal, solve the following system for y : 
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