SOLUTION: Bobbi bought a used car for $7,200. The car’s value decreases at a constant rate each year. After 9 years, the value decreased to $3,600 Use a function to model the car’s valu

Question 1151692: Bobbi bought a used car for $7,200. The car’s value decreases at a constant rate each year. After 9 years, the value decreased to $3,600
Use a function to model the car’s value as the number of years increases. Find this function’s domain and range in this context.
Answer by Edwin McCravy(20060) (Show Source): You can put this solution on YOUR website!

When x=0 years have passed the value is y=$7200.
When x=9 years have passed the value is y=$3600.

So we want the equation of a line that goes through the points
(0,7200) and (9,3600)

















or



The smallest value of x in the domain is when the largest value y is the full 
value of $7200.  That's when x=0 years.

The least value of x in the domain is when the smallest value is $0, when it is 
worthless.  We have to calculate that by substituting 0 for y and solving for x.






So the domain is [0,18]  (years)

The range is [0,7200]  (dollars)

Edwin

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