How do you create a scatter plot and find the line of best fit for: #(32, 43) (54, 61) (89, 94) (25, 34) (43, 56) (58, 67) (38, 46) (47, 56) (39, 48) #?
With a graphing calculator or a computer program.
The line of best fit is most easily found by using a program such as MATLAB, Mathematica, Logger Pro, Excel, or even your graphing calculator. I can't quite explain how to do it on your graphing calculator, but here's a great PDF.
Of course, you could always eyeball it. I wrote an answer on how to do this here.