Problem-Solving and Data AnalysisEasyYearly change from a line of best fit
Problem-Solving and Data Analysis practice question
For a set of used cars, the value y, in dollars, is modelled by y = 20,000 − 1,500x, where x is the car's age in years. According to the model, by how many dollars does a car's value fall each year?
- A. 1,500Correct
- B. 20,000
- C. 18,500
- D. 1,500 × 20,000
Answer: A. 1,500
The coefficient of x is the change in value per year of age.
Why the other answers are wrong
- B. 20,000
- 20,000 is the modelled value of a new car.
- C. 18,500
- 18,500 is the value at one year old.
- D. 1,500 × 20,000
- The two numbers are not multiplied.
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