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Given 5 pairs of points (X,Y) shown below.
(1)What line of the form y=a+bx best fit the data by method of least squares.
(2)What line of the form y=x+b best fit the data by method of least squares.
| X | 4 | 0 | -2 | 3 | 1 |
| Y | 5 | 0 | 0 | 6 | 3 |
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