document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1050502>Question 1050502</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A contractor buys 20 yd^2 of nylon carpet and 28 yd^2 of wool carpet for $1300. A second purchase, at the same prices, <BR>\n" );
document.write( "includes 15 yd^2 of nylon carpet and 20 yd^2 of wool carpet for $945. Find the cost per square yard of the wool carpet. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #666083 by </B><A HREF=/tutors/aboutme.mpl?userid=LinnW><B>LinnW(1048)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=LinnW><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=LinnW><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=666083\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let x be the price per yard for nylon carpet and<BR>\n" );
document.write( "y be the price per yard for wool carpet.<BR>\n" );
document.write( "20x + 28y = 1300<BR>\n" );
document.write( "15x + 20y = 945<BR>\n" );
document.write( "multiply the top equation by 3, and the bottom equation by -4<BR>\n" );
document.write( "60x + 84y = 3900<BR>\n" );
document.write( "-60x -80y = -3780<BR>\n" );
document.write( "Add the equations<BR>\n" );
document.write( "4y = 120<BR>\n" );
document.write( "divide each side by 4<BR>\n" );
document.write( "y = 30<BR>\n" );
document.write( "Substitute 30 for y in 15x + 20y = 945<BR>\n" );
document.write( "15x + 20(30) = 945<BR>\n" );
document.write( "15x + 600 = 945<BR>\n" );
document.write( "add -600 to each side<BR>\n" );
document.write( "15x = 345<BR>\n" );
document.write( "x = 23<BR>\n" );
document.write( "So nylon carpet is $23.00 per <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28yd%29%5E2 ALIGN=MIDDLE  ALT=\"%28yd%29%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "wool carpet is $30 per <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28yd%29%5E2 ALIGN=MIDDLE  ALT=\"%28yd%29%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );