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Homework Help: Graphing an equation on calculator question

  1. Sep 20, 2008 #1
    How do I graph an inverse parabola on a calculator? As in a normal parabola but opening to the left or right. Which means its X= instead of Y=.

    If this is impossible(I know it is possible to use two seperate equations), is there any other way to add more "Y="s on the graphing calculator? There is only 10 at the moment, and my assignment is to use basic graph and transformations to draw pictures, on a graphing calculator. My main problem right now is that I need more "Y="s to complete my picture, since it consists alot of semi circle equations(my picture has alot of circles).....

    If not (sigh), can anybody else think of some intricate but reasonable pictures that I can make? At the moment, I'm making headphones :)
  2. jcsd
  3. Sep 20, 2008 #2


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    Science Advisor

    You have three choices.

    1) Graph y= x2 and turn your calculator on its side.

    2) Graph the "inverse" function [itex]y= \sqrt{x}[/itex]. Because f(x)= x2 does not have a true inverse, that does not give you the entire parabola- there is no function that is the "inverse" of f(x)=x2. You will, as you say, have to use two functions, [itex]y= \sqrt{x}[/itex] and [itex]y= -\sqrt{x}[/itex]

    3) Use the "parametric functions" graphing mode if your calculator has one. Let y= t, x= t^2.

    Since you don't say what kind of calculator you have, I have no idea whether it is limited to 10 graphs or not.
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