Question: You manage a car dealership that sells economy cars of similar styles at various ages. A customer wants to trade in a car with a new purchase. The car is 8 years old. Using linear regression, what do you think the car will sell for if you take the car as a trade in?

Car Age (in years)	Sale Price (in dollars)
4	6300
4	5800
5	5700
5	4500
7	4500
7	4200
8	4100
9	3100
10	2100
11	2500
12	2200