document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=559161>Question 559161</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the model for unkowns for this problem: Mrs. B invested $30,000: part at 5%, and part at 8%. The total interest on the investment was $2100. How much did she invest at each rate?\r<BR>\n" );
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document.write( "I started here:  $30,000-x=7<BR>\n" );
document.write( "x=.05<BR>\n" );
document.write( "y=.08<BR>\n" );
document.write( "Stuck now... </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #363316 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=363316\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x + y = 30000 ___ x = 30000 - y\r<BR>\n" );
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document.write( "(5%)x + (8%)y = 2100\r<BR>\n" );
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document.write( "substituting ___ (.05)(30000 - y) + (.08y) = 2100 ___ 1500 + .03y = 2100\r<BR>\n" );
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document.write( "solve for y; then substitute back to find x </SPAN>\n" );
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