mathfunctions
posted by Christa .
A car purchased for $11900 has a resale value of $2000 after 10 years. Assuming its resale value decreased linearly over these years, what was the resale value of the car after 3 years?

two given ordered pairs:
(0,11900)
(10,2000)
m = slope = (200011900)/ (10  0) =990 per year
so
11900  3(990) = 8930