document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=209884>Question 209884</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/9780136028956/algebrahomeworkh>algebra blitzer</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> how to eliminate variables by using the addition method?.<BR>\n" );
document.write( "3x-4y+4z=7<BR>\n" );
document.write( "x-y-2z=2<BR>\n" );
document.write( "2x-3y+6z=5 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #160301 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=160301\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  how to eliminate variables by using the addition method?.<BR>\n" );
document.write( "3x-4y+4z=7<BR>\n" );
document.write( "x-y-2z=2<BR>\n" );
document.write( "2x-3y+6z=5<BR>\n" );
document.write( "-----------------------<BR>\n" );
document.write( "Put the 2nd equation in the 1st line.<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x-y-2z=2<BR>\n" );
document.write( "3x-4y+4z=7<BR>\n" );
document.write( "2x-3y+6z=5<BR>\n" );
document.write( "---------------<BR>\n" );
document.write( "Add -3 times the 1st equation to the 2nd<BR>\n" );
document.write( "Add -2 times the 1st equqtion to the 3rd<BR>\n" );
document.write( "----<BR>\n" );
document.write( "x-y-2z=2<BR>\n" );
document.write( "0x-y+10z = 1<BR>\n" );
document.write( "0x-y+10z = 1<BR>\n" );
document.write( "------<BR>\n" );
document.write( "Subtract 2nd equation from 3rd to get:<BR>\n" );
document.write( "x-y-2z=2<BR>\n" );
document.write( "0-y+10z=1<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "y = 10z-1<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "x + 1-10z -2z = 2<BR>\n" );
document.write( "x-12z = 1<BR>\n" );
document.write( "x = 12z + 1<BR>\n" );
document.write( "----------------------<BR>\n" );
document.write( "Solution:<BR>\n" );
document.write( "x = 12z+1<BR>\n" );
document.write( "y = 10z-1<BR>\n" );
document.write( "z = z<BR>\n" );
document.write( "====================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "stan H.                          1<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );