A store has three products: cars, trucks, and trains.

There needs to be a total of 500 units

each car takes 3 hour to labor

each truck takes 5 hours to labor

each train takes 2.1 hours of labor

there is a mandate of 2500 hours of labor

there needs to be 3 times the trains as trucks

what would be the system of linear equations that would be used to find the quantity of each item that can be produced.