How to plot polynomial function as well as points input on the same graph?

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Ling Fang Toh
Ling Fang Toh on 10 Jan 2013
I need to plot a polynomial equation in the form y = A + Bx + Cx^2 + Dx^3 without getting the 'square matrix' error.
On the same graph, i need to plot another few lines by several input points (x,y) in order to compare the variation of the lines.
How may I do it?

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