Software to plot graphs?

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I have an assignment to submit tomorrow and I've run out of graph paper. I need to plot quadratic equations. Do you know of any software using which I can plot line graphs? I'm not looking for an easy escape software in which if I write down the equation, the graph plots itself. I'm looking for a simple graphing software in which I can simply add values.

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The basic software for this is Geogebra.

https://www.geogebra.org/

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You can use python matplotlib. It's a python library for plotting 2D graph.
http://matplotlib.org
Check this link for documentation and installation instruction.