# Implicit function grapher

1. Mar 7, 2006

### arunbg

Can anybody give me links to download software that can plot implicit functions like x^2 + xy =9 etc.
I have searched the net but all that i have found are shareware demos that expire after a period.I am sure there are freeware plotters of this kind but cant find any.

2. Mar 7, 2006

### VietDao29

I often use Graph to plot 2D function (implicit ones included). It's free, and pretty easy to use, I may be inclined to say that it's also user-friendly. And I just love it.
On the task bar, just click on the button x < y, then type in the relation x ^ 2 + x * y = 9, and press Enter. Pretty easy, huh? :)
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P.S: The implicit equation above can be rearranged to give:
$$y = \frac{9 - x ^ 2}{x} = -x + \frac{9}{x}$$, and it's no longer an implicit function.

Last edited: Mar 7, 2006
3. Mar 8, 2006

### arunbg

Thanks Vietdao