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Question 723416: Suppose the value of a car depreciates linearly for 15 years after it is bought. Also, suppose the value of the new car is $25,000 and the value 10 years after it is bought is $9,000. Let y be the value of the car x years after it is bought. Find a linear equation relating x and y. Write in y = mx + b form. I came up with y=1,600 + 23,400. I don't feel this is correct???
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Suppose the value of a car depreciates linearly for 15 years after it is bought. Also, suppose the value of the new car is $25,000 and the value 10 years after it is bought is $9,000. Let y be the value of the car x years after it is bought. Find a linear equation relating x and y. Write in y = mx + b form. I came up with y=1,600 + 23,400. I don't feel this is correct???
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You have 2 points relating time and value: (0,25000) and (10,9000)
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slope = (9000-25000)/(10-0) = 1600
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intercept is f(0) = 25000
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Equation:
value = 1600(years) + 25000
v = 1600x + 25000
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Cheers,
Stan H.
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