By using the method of least squares, find the best line through the points: (−2,−1), (2,1), (0,—3). Step 1. The general equation of a line is c + ₁ = y. Plugging the data points into this formula gives a matrix equation Ac = y. Step 2. The matrix equation Ac = y has no solution, so instead we use the normal equation AªAê=A¹y ATA = ATy Step 3. Solving the normal equation gives the answer Ĉ= which corresponds to the formula y = [a]

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