Question: The data points (2, 3), (5, 9), and (10, 19) all lie on the line y = 2x -1. Explain why that line must be

The data points (2, 3), (5, 9), and (10, 19) all lie on the line y = 2x -1. Explain why that line must be the least-squares fit to the three data points.

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