document.write( "Question 875427: In 1990, a music store sold 250 CDs per day, in 1995, they sold 175 CDs per day. Assuming a linear relationship, how many CDs did the store sell per day in 2005? \n" ); document.write( "

Algebra.Com's Answer #528173 by josgarithmetic(39617) $\"\"$ $\"About$

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Three points are (1990, 250), (1995, 175), (2005, y).\r
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\n" ); document.write( "\n" ); document.write( "The first two points define the linear relationship:
\n" ); document.write( " $\"m=%28175-250%29%2F%281995-1990%29\"$
\n" ); document.write( " $\"m=-75%2F5\"$
\n" ); document.write( " $\"m=-15\"$
\n" ); document.write( "-
\n" ); document.write( " $\"y=mx%2Bb\"$
\n" ); document.write( " $\"b=y-mx\"$
\n" ); document.write( " $\"b=175-%28-15%2A1995%29\"$
\n" ); document.write( " $\"b=30100\"$
\n" ); document.write( " $\"highlight_green%28y=-15x%2B30100%29\"$
\n" ); document.write( "-\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Find y for x=2005:
\n" ); document.write( " $\"highlight%28y=-15%2A2005%2B30100%29\"$ \n" ); document.write( "

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