For a set of points, I want to get the straight line that is the closest approximation of the points using a least squares fit.

I can find a lot of overly complex solutions here on SO and elsewhere but I have not been able to find something simple. And this should be very simple.

var arr = new Point[] {{1,2}, {3,4}, {12, 9}};
Tuple<slope, intercept> = leastSquares(arr)

Is there some library function that implements the above leastSquares()?

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