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    Spydur's Avatar
    Spydur Posts: 1, Reputation: 1
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    #1

    Oct 15, 2009, 02:34 PM
    Graphing Parabolas
    Okay, these are homework questions that I have, and I am kind of having a hard time with it.
    Here it is:
    Find the vertex, focus, and directrix of the parabola. Sketch the graph. Showing the focus and the directrix.

    2.) 20x=y^2

    4.) x^2= -3y

    Can anyone help, please? :o
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Oct 16, 2009, 11:29 AM


    To graph, solve for y and get

    To find the focus and directrix, use

    because it opens downward.





    The focus and directrix are 3/4 units above and below the origin.

    The directrix is at y=3/4 and the focus at (0,-3/4)

    The other one opens to the right. Do the same thing.
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