document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=865013>Question 865013</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve the system of equations by substitution <BR>\n" );
document.write( "y=3x+7<BR>\n" );
document.write( "y=x-9 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #521466 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=521466\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> \r<BR>\n" );
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document.write( "y=3x+7 ... start with the first equation\r<BR>\n" );
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document.write( "x-9=3x+7 ... plug in y = x-9\r<BR>\n" );
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document.write( "x-9-7=3x\r<BR>\n" );
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document.write( "-9-7=3x-x\r<BR>\n" );
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document.write( "-16=2x\r<BR>\n" );
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document.write( "2x=-16\r<BR>\n" );
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document.write( "x=-16/2\r<BR>\n" );
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document.write( "x=-8\r<BR>\n" );
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document.write( "Now use this to find y\r<BR>\n" );
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document.write( "y=x-9\r<BR>\n" );
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document.write( "y=-8-9\r<BR>\n" );
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document.write( "y=-17\r<BR>\n" );
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document.write( "So the solutions are x=-8 and y=-17 </SPAN>\n" );
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