How do I find a best-fit function for a curve with negative slope?

[dbell]

In my math homework, a problem asks to derive the function of a set of given points. After plotting all the points I realized that the graph is a curve with a negative slope. I have no idea on how to derive a "Best Fit" function that represents the curve. Is there something easy that I am missing?? Please help...

 

[sutupidmath]

I think this link might be useful:

http://www.bsu.edu/web/jkshim/mathandstat/lsm/leastsquare.htm

 

[symbolipoint]

You study functions and learn how several of them appear when you study Intermediate Algebra (or even "Elementary Functions"). What does your set of points LOOK LIKE on a cartesian system? This suggests what function to choose for modeling the set of points. Have you reached this far yet?

 

[dbell]

My graph looks like the one in the attachment.

 

[symbolipoint]

My graph looks like the one in the attachment.

That certainly can cause a delay while approval of the file pends. Do you have another quicker representation of your data? Like I earlier asked, What does your set of points on a cartesian system look like?