document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=117744>Question 117744</A>: <I><SPAN STYLE=\"word-break: break-all;\"> please help!!! I just spent 2 hours trying to figure this out. I have multiplied the second equation by -1 to eliminate two variables but the answer seemed wrong. I tried again and multiplied the first equation by -3 to eliminate z but this answer also seemed wrong. here is the problem...\r<BR>\n" );
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document.write( "solve the linear system without using matrices or detemrinants\r<BR>\n" );
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document.write( "0.1x+0.2y+0.2z=0.2<BR>\n" );
document.write( "0.3x+0.5y+0.1z+-0.1<BR>\n" );
document.write( "0.2x-0.3y-0.5z=0.7 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #85712 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=85712\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 0.1x+0.2y+0.2z=0.2<BR>\n" );
document.write( "0.3x+0.5y+0.1z+-0.1<BR>\n" );
document.write( "0.2x-0.3y-0.5z=0.7<BR>\n" );
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document.write( "Multiply every thing by 10 to get rid of the decimals:<BR>\n" );
document.write( "x +2y+2z=2<BR>\n" );
document.write( "3x+5y+z=-1<BR>\n" );
document.write( "2x-3y-5z=7<BR>\n" );
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document.write( "Multiply 1st by 3 and subtract from 2nd<BR>\n" );
document.write( "Then Multiply 1st be 2 and subtract form 3rd.<BR>\n" );
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document.write( "x +2y+2z=2<BR>\n" );
document.write( "0 -y -5z=-7<BR>\n" );
document.write( "0 -7y-9z=3<BR>\n" );
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document.write( "Divide thru 2nd by -1<BR>\n" );
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document.write( "x +2y+2z=2<BR>\n" );
document.write( "0  y +5z=+7<BR>\n" );
document.write( "0 -7y-9z=3<BR>\n" );
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document.write( "Multiply 2nd by 7 and add to 3rd:<BR>\n" );
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document.write( "x +2y+2z=2<BR>\n" );
document.write( "0  y +5z=+7<BR>\n" );
document.write( "0  0 26z=52<BR>\n" );
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document.write( "Divide thru 3rd by 26 to get:<BR>\n" );
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document.write( "x +2y+2z=2<BR>\n" );
document.write( "0  y +5z=+7<BR>\n" );
document.write( "0  0  z =2<BR>\n" );
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document.write( "Now that you know z=2 you can solve 2nd for y; then you<BR>\n" );
document.write( "can solve 1st for x.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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