document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=670813>Question 670813</A>: <I><SPAN STYLE=\"word-break: break-all;\"> x-3y                = 12<BR>\n" );
document.write( "          2y -3z = -9<BR>\n" );
document.write( "2x                  +z  = 7\r<BR>\n" );
document.write( "\n" );
document.write( "solve for all three variables  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #417128 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=417128\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Hint:\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Solve for z in 2x +z = 7  to get z = -2x+7\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Then  plug this into the second equation to get\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "2y -3z = -9\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "2y -3(-2x+7) = -9\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "2y + 6x - 21 = -9\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "2y + 6x = -9 + 21\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "2y + 6x = 12\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "6x + 2y = 12\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "-------------------------------------------------------\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "You now have the system\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "x-3y = 12<BR>\n" );
document.write( "6x + 2y = 12\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Use any method to solve this to find x and y. Then use x to find z. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );