document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=388587>Question 388587</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Ques 7.<BR>\n" );
document.write( "A music store is selling compact disks for $11.50 and $7.50. You buy<BR>\n" );
document.write( "    12 disks and spend a total of $110.  How many compact disks that cost<BR>\n" );
document.write( "    $11.50 did you buy?\r<BR>\n" );
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document.write( "I need these answers to be as straightforward as possible. No shown work is needed. *Thank you for all simply put answers*\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #274930 by </B><A HREF=/tutors/aboutme.mpl?userid=texttutoring><B>texttutoring(324)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=texttutoring><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=texttutoring><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=274930\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let x = number of $11.50 discs you bought<BR>\n" );
document.write( "let y = number of $7.50 discs you bought\r<BR>\n" );
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document.write( "Two equations:\r<BR>\n" );
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document.write( "x+y=12 (because there are 12 disks bought in total)<BR>\n" );
document.write( "11.50x + 7.50y = 110 (because the total cost is $110)\r<BR>\n" );
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document.write( "Use substitution or elimination to solve. I will use substitution.\r<BR>\n" );
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document.write( "y = 12-x\r<BR>\n" );
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document.write( "11.50x +7.50(12-x) = 110<BR>\n" );
document.write( "11.50x + 90 -7.5x = 110<BR>\n" );
document.write( "4x = 20<BR>\n" );
document.write( "x = 5\r<BR>\n" );
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document.write( "So there were five $11.50 disks bought. This means there must have been seven $7.50 disks bought. </SPAN>\n" );
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