Are these linear equations? If they are linear equations, you would only need to draw a line between two x,y points. Do you need help on drawing? Or are your equations more complex and non-linear?
if you have a non-linear equation, you could do something like this to draw a graph of an equation (in this case y = x*x)
for (var x:Number=0.1;x<10;x=x+0.1)