Write a system of equations to describe the situation below, solve using substitution, and fill in the blanks. Mr. Murray, the owner of two car dealerships in Newberry, is holding a contest to see which one can sell the most cars. Newberry Cars has already sold 5 cars, and Murray's Autos has sold 10 cars. Going forward, the salespeople at Newberry Cars think they can sell 9 cars per day, whereas the salespeople at Murray's Autos are aiming for sales of 8 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? How long will that take?

The dealerships will each have sold cars in days.