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The least square fit method.

I am upto the stage where i have created my matrix 2 x 2, and then i have invesed the matrix 2 x 2 and then got a fraction and a [2x2] matrix.

Now i am stuck.

The text book has the inverse matrix, and the matrix of co-ordinates used to create the origional matrix, and i dont get how the anser is established

Any help most appreciated