November 16th, 2011, 04:13 PM  #1 
Newbie Joined: Oct 2011 Posts: 29 Thanks: 0  Equation of a line
This isn't exactly a chemistry related question, but it does in the context I have to work with(The data are pressure versus volume). I've analyzed a sample of around 15 volume's with their corresponding pressure. The document I have to fill asks me to get an approximation of the linear graph equation. Clearly getting two points and finding ax + b would be the idea here. But it states that I need to account all the points I've collected. Therefore I'm left clueless on how I could deal with finding the equation. Here are some of the values: Volume (ml) 1/P (kPa) 15 0.005179 20 0.006653 25 0.008244 30 0.009814 35 0.011325 So does anyone have any idea on how I should get the linear graph equation considering most points to get an average? 
November 17th, 2011, 01:35 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,766 Thanks: 698  Re: Equation of a line
You need to do a least squares fit. http://en.wikipedia.org/wiki/Least_squares http://mathworld.wolfram.com/LeastSquaresFitting.html 

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