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Linear Regression Equations : 3 Equations, 3 Unknowns

How do you go mathamatically from eq. 12.4 to eq. 12.5 when solving three equations with three unknowns given the summation rules on page 460? Please show all steps of the mathamatical work by hand without using any computer programs


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Linear regression equations are solved. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.