document.write( "Question 166586: The equations S =5000 + 200x and D =9500 - 100x express the supply S and the demand D, respectively, for a popular music in terms of its price x (in dollars). \n" ); document.write( "
Algebra.Com's Answer #122784 by nerdybill(7384)\"\" \"About 
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You don't say what the problem is asking for, but I suspect they want to know the amount (x) when supply equals demand.
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\n" ); document.write( "If so, set the two given equations equal to each other and solve for 'x':
\n" ); document.write( "5000 + 200x = 9500 - 100x
\n" ); document.write( "5000 + 300x = 9500
\n" ); document.write( "300x = 4500
\n" ); document.write( "x = $15
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