document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=220740>Question 220740</A>: <I><SPAN STYLE=\"word-break: break-all;\"> what is the step for solving:<BR>\n" );
document.write( "x+y=4<BR>\n" );
document.write( "x+z=4<BR>\n" );
document.write( "y+z=4 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #165648 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=165648\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> what is the step for solving:<BR>\n" );
document.write( "x+y=4<BR>\n" );
document.write( "x+z=4<BR>\n" );
document.write( "y+z=4<BR>\n" );
document.write( "---------<BR>\n" );
document.write( "There are several methods.  One is to look at it and see that<BR>\n" );
document.write( "x = y = z = 2<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "Another is elimination and substitution.<BR>\n" );
document.write( "x+y=4 Eqn 1 --> x=4-y<BR>\n" );
document.write( "x+z=4 Eqn 2<BR>\n" );
document.write( "y+z=4 Eqn 3<BR>\n" );
document.write( "-----------Sub for x into Eqn 2<BR>\n" );
document.write( "x+z = 4<BR>\n" );
document.write( "4-y + z = 4<BR>\n" );
document.write( "y = z<BR>\n" );
document.write( "Sub for y into Eqn 3<BR>\n" );
document.write( "z+z = 4<BR>\n" );
document.write( "z = 2<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "y = 2<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "x = 2<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );