SOLUTION: A car dealership sold 650 cars in 1990 and 900 cars in 2000. Write a linear equation for cars sold. Use the equation to predict sales in 2004.

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: A car dealership sold 650 cars in 1990 and 900 cars in 2000. Write a linear equation for cars sold. Use the equation to predict sales in 2004.      Log On


   

Question 178885: A car dealership sold 650 cars in 1990 and 900 cars in 2000. Write a linear equation for cars sold. Use the equation to predict sales in 2004.
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
so we have 10 years between 1990 and 2000
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we must find the increase per year.
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since the increase is 350 cars over 10 years we just divide that by number of years which is 10
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350/10=35
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so lets call S the number of cars sold and it is a function of time t
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highlight%28S%28t%29=35t%2B650%29........so our beginning year is 1990 and in that year they sold 650
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cars.
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year 2004 would be 14 year or t=14
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S%2814%29=35%2814%29%2B650=490%2B650=highlight%281140%29estimated cars sold in 2004
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