[R] Plotting multiple curves on a plot

[ascentnet]

Greetings!

I was wondering how to plot multiple equation on the same plot with the
data?

So if I have three equations: 

1.y= 2.31X + -2.2
2.y=  2.27X^2 + 5.63X + 0.52
3.y=  -1.53X^3 +  1.92X^2 + -4.72X + 4.57

and a datafram or a 2D matrix.  I would also like the equations in different
colors, but that is extra!

thanks in advance,
Ben.
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