document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=104155>Question 104155</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hello! I'm having problems with substitution and for the following problem i keep getting X=7 y=4 and z=1. I thought this made sense but my answer sheet says it should be x=2 y=1 and z=1. Could you show me how its done so i can compare it to the way i've been trying?\r<BR>\n" );
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document.write( "here's the equation and thank you!!!\r<BR>\n" );
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document.write( "-3x-3y+2z=-7<BR>\n" );
document.write( "z=1<BR>\n" );
document.write( "-2x-3y+z=-6 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #75780 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=75780\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> -3x-3y+2z=-7<BR>\n" );
document.write( "z=1<BR>\n" );
document.write( "-2x-3y+z=-6<BR>\n" );
document.write( "----------------<BR>\n" );
document.write( "Substitute z for z and rewrite the equations:<BR>\n" );
document.write( "-3x-3y=-9<BR>\n" );
document.write( "-2x-3y=-7<BR>\n" );
document.write( "------------<BR>\n" );
document.write( "Subtract the 1st equation by the 2nd to get:<BR>\n" );
document.write( "x = 2<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "Substitute into -2x-3y=-7 to solve for y:<BR>\n" );
document.write( "-2*2-3y = -7<BR>\n" );
document.write( "-3y = -3<BR>\n" );
document.write( "y = 1<BR>\n" );
document.write( "================<BR>\n" );
document.write( "Solution:<BR>\n" );
document.write( "x = 2; y = 1, z = 1<BR>\n" );
document.write( "==============<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
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