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I'm wondering if there is a plotting tool out there that will work in symbolic math?

For example, if I plot $x+y=a$ and $y=x$ on a chart, I should be able to click on the point of intersection to get $\left(\large \frac{a}{2},\frac{a}{2}\right)$.

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    How do you expect it to plot $x + y = a$ without knowing the value of $a$ (e.g. whether it's positive or negative, which affects where the line should be drawn)?2011-06-16
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    BTW, not exactly what you want, but [Geogebra](http://www.geogebra.org/) is great. You can give it a specific value of $a$ like $a=5$ or something, ask it to plot the lines $x+y=a$ and $y=x$, ask it to compute their intersection, and it will will show you the coordinates and automatically update them as you modify $a$.2011-06-16
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    I suppose Mathematica (or WolframAlpha) will do that, but that might be a bit heavier than what you need.2011-06-16
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    @ShreevatsaR: Do you know whether you can save your "Geogebra-ic" work an image file (.jpg, .png, .gif), etc., or is it only "save-able" as a Geogebra file that only Geogebra can open? Just curious.2011-06-16
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    @amWhy: Geogebra can export files in .png, .bmp, and .eps, as far as I can remember.2011-06-17
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    @Beni: Thanks! I'll give it a look (though I'm taxing my laptop with more software than I can even dream of using!)...time to start "weeding" :)2011-06-17

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