Mr. shen, the owner of two car dealerships in bloomington, is holding a contest to see which one can sell the most cars. bloomington cars has already sold 20 cars, and shen's autos has sold 15 cars. going forward, the salespeople at bloomington cars think they can sell 3 cars per day, whereas the salespeople at shen's autos are aiming for sales of 4 cars per day. if the salespeople's predictions are accurate, it won't be long before the two dealerships are tied.  how many cars will each lot have sold? write a system of equations, graph them, and type the solution.