document.write( "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. \n" ); document.write( "

Algebra.Com's Answer #133835 by Mathtut(3670) $\"\"$ $\"About$

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so we have 10 years between 1990 and 2000
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\n" ); document.write( "we must find the increase per year.
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\n" ); document.write( "since the increase is 350 cars over 10 years we just divide that by number of years which is 10
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\n" ); document.write( "350/10=35
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\n" ); document.write( "so lets call S the number of cars sold and it is a function of time t
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\n" ); document.write( " $\"highlight%28S%28t%29=35t%2B650%29\"$ ........so our beginning year is 1990 and in that year they sold 650
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\n" ); document.write( "year 2004 would be 14 year or t=14
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\n" ); document.write( " $\"S%2814%29=35%2814%29%2B650=490%2B650=highlight%281140%29\"$ estimated cars sold in 2004
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