document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1159372>Question 1159372</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve the following word problem using matrices:\r<BR>\n" );
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document.write( "Part of $30,000 is invested at 6% yearly interest, another part at 7%, and the remainder at 8% yearly interest.  The total yearly interest income from the three investments adds up to $2200.  The sum of the amounts invested at 6% and 7% equals the amount of money invested at 8%.  How much is invested at each rate?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #782475 by </B><A HREF=/tutors/aboutme.mpl?userid=MowMow><B>MowMow(42)</B></A><img src=\"/images/stars/stars-07.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MowMow><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=MowMow><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=782475\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Using matrices to solve this problem:<BR>\n" );
document.write( "The 3x4 matrix is:<BR>\n" );
document.write( "x    y    z   Amount<BR>\n" );
document.write( "1    1    1   30000<BR>\n" );
document.write( ".06 .07  .08   2200<BR>\n" );
document.write( "1    1   -1       0   <BR>\n" );
document.write( "  <BR>\n" );
document.write( "The answer is<BR>\n" );
document.write( "x = $ 5,000<BR>\n" );
document.write( "y = $10,000<BR>\n" );
document.write( "z = $15,000 </SPAN>\n" );
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