document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=863259>Question 863259</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A parabola has its vertex at the origin, and the coordinates of its focus are (0,10). Find the equation of the directrix.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #520323 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39620)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=520323\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Focus and Directrix, midpoint being the vertex.  Now you can figure the distance from the directrix to the vertex.  How's that?  Simple visualization, and very little thinking, and NO symbolic operations needed. </SPAN>\n" );
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