document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=97794>Question 97794</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0199148031/algebrahomeworkh>Introducing Pure Mathematics</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> help me pleasee!! Solve simultaneously:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=log+xy+=7 ALIGN=MIDDLE  ALT=\"log+xy+=7\"   DISABLED_style= \"max-width:90%; height:auto;\" > , <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=log+%28x%2Fy%29=+10 ALIGN=MIDDLE  ALT=\"log+%28x%2Fy%29=+10\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "so far ... if <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=log+%28base+10%29+%28x%2Fy%29=10 ALIGN=MIDDLE  ALT=\"log+%28base+10%29+%28x%2Fy%29=10\"   DISABLED_style= \"max-width:90%; height:auto;\" > this implies that <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x%2Fy%29=10 ALIGN=MIDDLE  ALT=\"%28x%2Fy%29=10\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "therfore, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=10y ALIGN=MIDDLE  ALT=\"x=10y\"   DISABLED_style= \"max-width:90%; height:auto;\" > ... thats all i got! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #71140 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=71140\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> log xy =7 , log (x/y)= 10<BR>\n" );
document.write( "-----------<BR>\n" );
document.write( "logx + logy = 7<BR>\n" );
document.write( "logx - logy = 10<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "Add the two equations to get:<BR>\n" );
document.write( "2logx = 17<BR>\n" );
document.write( "log x = 8.5<BR>\n" );
document.write( "x = 10^8.5<BR>\n" );
document.write( "-----------<BR>\n" );
document.write( "Substitute that into one of the equations with y and solve for y:<BR>\n" );
document.write( "log(10^8.5) + log y = 7<BR>\n" );
document.write( "8.5 + logy = 7<BR>\n" );
document.write( "logy = 7-8.5<BR>\n" );
document.write( "logy = -1.5<BR>\n" );
document.write( "y = 10^(-1.5)<BR>\n" );
document.write( "===================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );