document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=669818>Question 669818</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A theater seats 990 people. For a sellout performance, full price tickets are $8.50 and student tickets are $4.00. If ticket sales were $6885, then how many student tickets were sold.\r<BR>\n" );
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document.write( "I think it starts like this:\r<BR>\n" );
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document.write( "6885=8.5(990-y)+4(990-x) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #416579 by </B><A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><B>ReadingBoosters(3246)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ReadingBoosters><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=416579\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x+y = 990<BR>\n" );
document.write( "8.5x + 4y = 6885<BR>\n" );
document.write( "...<BR>\n" );
document.write( "Substitute for one variable, the idea is to isolate and solve for one variable at a time.<BR>\n" );
document.write( "8.5(990-y) + 4y = 6885<BR>\n" );
document.write( "8415 - 8.5y + 4y = 6885<BR>\n" );
document.write( "...<BR>\n" );
document.write( "-4.5y = -1530<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28y+=+340%29 ALIGN=MIDDLE  ALT=\"highlight_green%28y+=+340%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > students<BR>\n" );
document.write( "...<BR>\n" );
document.write( "8.5x + 4(990-x) = 6885<BR>\n" );
document.write( "8.5x + 3960 - 4x = 6885<BR>\n" );
document.write( "4.5x = 2925<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%28x+=+650%29 ALIGN=MIDDLE  ALT=\"highlight_green%28x+=+650%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > non-students<BR>\n" );
document.write( ".....................<BR>\n" );
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document.write( "-Reading Boosters<BR>\n" );
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