document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1078729>Question 1078729</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Use the distance formula to find the equation of a parabola with a focus at (0, -10) and a directrix as y = 10.\r<BR>\n" );
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document.write( "y = (1/40)x^2<BR>\n" );
document.write( "y = x^2 + (1/40)<BR>\n" );
document.write( "y = 40x^2<BR>\n" );
document.write( "y = x^2 + 40<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 #693151 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=693151\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Vertex is half way between focus and directrix.<BR>\n" );
document.write( "That puts the vertex at 0.<BR>\n" );
document.write( "p=10\r<BR>\n" );
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document.write( "x^2=4*10y<BR>\n" );
document.write( "40y=x^2<BR>\n" );
document.write( "y=(1/40)x^2<BR>\n" );
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