document.write( "Question 1087425: Sketch the graph and identify focus, directrix, vertex, latus rectum and axis of symmetry: x^2 = 18y
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Algebra.Com's Answer #701940 by Edwin McCravy(20056) $\"\"$ $\"About$

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This one is similar to the other ones I did for you except that\r\n" );
document.write( "y and x are interchanged, h and k are interchanged, graphs opening \r\n" );
document.write( "right and left are changed to opening up and down.\r\n" );
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document.write( "has vertex (h,k), and distance from vertex to both focus\r\n" );
document.write( "and directrix is |p|.  If p is positive the parabola opens\r\n" );
document.write( "upward with the horizontal directrix is |p| units below the \r\n" );
document.write( "vertex and the focus is |p| units above the vertex.  \r\n" );
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document.write( "has vertex (0,0), and distance from vertex to both focus\r\n" );
document.write( "and directrix is |18/4| or 9/2.  Since 9/2 is positive the \r\n" );
document.write( "parabola opens upward with the vertical directrix 9/2 units  \r\n" );
document.write( "below the vertex and the focus is 9/2 above the vertex.  \r\n" );
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document.write( "So the focus is 9/2 units above vertex (0,0) which is (0,9/2),\r\n" );
document.write( "and the directrix is a horizontal line 9/2 units below the \r\n" );
document.write( "vertex (0,0) which is the horizontal line y = -9/2\r\n" );
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document.write( "Edwin

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