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Considere a linha recta \alpha que melhor se ajusta, no sentido dos mínimos quadrados, aos pontos
\left[\begin{matrix} 0\\ 1\end{matrix}\right],
\left[\begin{matrix} 3\\ 4\end{matrix}\right] e
\left[\begin{matrix} 6\\ 5\end{matrix}\right].
A recta \alpha passa no ponto
\left[\begin{matrix} 1\\ a\end{matrix}\right], sendo
a= .
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