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I need to know how to plot any kind of equation between $x$ and $y$ without solving it for $y$. For example, for $x^2+y^2=1$ I need the plot without knowing that $y=\pm \sqrt {1-x^2}$.

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    are you trying in matlab or excel?2012-10-30
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    no,no. I need to do this by hand, not with a program :). If I needed that I would have tried [link](http://www.wolframalpha.com/input/?t=crmtb01&f=ob&i=plot%3A%20x%5E2%2By%5E2%3D1).2012-10-30
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    I would pick a range for x and compute the value of y for each of those values of x. Hope this helps.2012-10-30
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    It's almost impossible w/o a computer.2012-10-30
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    @BinaryBurst: Do you have a log table or slide rule with you?2012-11-02

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