The sums have been evaluated. Solve the simplified system for a and b to find the least squares regression line for the points. Use a graphing utility to confirm the result. (Note: The symbol Σ is used to denote a sum of the terms of a sequence. You will learn how to use this notation in Section11.1.)
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5b + 10a = 20.2 (10b + 30a = 50.1 64 (4, 5.8). (3, 5.2) (2, 4.2) 3 (1, 2.9) 2. |(0, 2.1) +++ 1 2 3 4 5 -1+