How do I do a best fitting line on Microsoft excel?

[Newellmyra]

I have to make a graph on Microsoft excel 2003 but I need to make a best fitting line and I dont know how. Can someone tell me how?

[Bob Phillips]

Do you mean a trendline?

If so, build your chart, then just click on one of (any one) the data points, they will all get selected, and then right click and select Add Trendline.