Question 1005605
This must be y= -2800x+20,000, because the resale value of a car decreases over time, doesn't appreciate.

The x-intercept is when y=0, and 2800x=20,000
x= 7.1428 and that means the resale value is 0 after 7.14 years.
The initial purchase price of the car is $20,000, when x=0
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The amount the car's value changes is $2800 less each year, using the equation above.
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The amount of decrease in the value of the car is $2800x, where x is the number of years.
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The car has no resale value after 7.14 years (above), and that is the x-intercept.