Classified ads in newspaper offered for sale several used cars of the same make and model. Listed below are the ages of cars and the advertised prices.
| ages (yr) |
price advertised ($) |
| 1 |
11,500 ; 9,995 |
| 2 |
9750 |
| 3 |
10,995 ; 9,250 |
| 4 |
7,250 ; 9,500 |
| 5 |
6,750 ; 6,500 |
| 6 |
7,750 ; 6,995 |
| 9 |
4,500 ; 5,000 ; 4,250 |
| 11 |
3,000 ; 1,750 |
| 13 |
1,750 |
Find the equation of the regression line.