Ready solution of the problem. The sorcerer of Arutyunov. Task number 278.

271 - 280. Five values of the unknown function y = f (x) were experimentally obtained for five values of the argument, which are written in the table. Using the method of least squares, find the function y = f (x) in the form y = ax + b.

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Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)