document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=7839>Question 7839</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need to figure the following out.  I have tried it but I get confused, I can't seem to get anywhere with it\r<BR>\n" );
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document.write( "x varies directly as the square of s and inversely as t.  How does x change when s is doubled?  When both s and t are doubled?\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #4315 by </B><A HREF=/tutors/aboutme.mpl?userid=Earlsdon><B>Earlsdon(6294)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Earlsdon><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=4315\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You can write the relationship between x and s & t as follows:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+k%28s%5E2%2Ft%29 ALIGN=MIDDLE  ALT=\"x+=+k%28s%5E2%2Ft%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > k is known as the constant of proportionality.\r<BR>\n" );
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document.write( "If you want to see the effect on x when s is doubled, just replace s with 2s.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+k%28%282s%29%5E2%29%2Ft ALIGN=MIDDLE  ALT=\"x+=+k%28%282s%29%5E2%29%2Ft\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k%284s%5E2%29%2Ft ALIGN=MIDDLE  ALT=\"k%284s%5E2%29%2Ft\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4k%28s%5E2%29%2Ft ALIGN=MIDDLE  ALT=\"4k%28s%5E2%29%2Ft\"   DISABLED_style= \"max-width:90%; height:auto;\" > which is 4 times the original equation for x.  So x is quadrupled when s is doubled.\r<BR>\n" );
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document.write( "Now let's double both s and t by substituting 2s and 2t into the original equation.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+k%282s%29%5E2%2F2t ALIGN=MIDDLE  ALT=\"x+=+k%282s%29%5E2%2F2t\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k%284s%5E2%29%2F2t ALIGN=MIDDLE  ALT=\"k%284s%5E2%29%2F2t\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=k%282s%5E2%2Ft%29 ALIGN=MIDDLE  ALT=\"k%282s%5E2%2Ft%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2k%28s%5E2%29%2Ft ALIGN=MIDDLE  ALT=\"2k%28s%5E2%29%2Ft\"   DISABLED_style= \"max-width:90%; height:auto;\" > and here, you can see that the effect on x is to double it when you double both s and t. </SPAN>\n" );
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