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[ADVANCE]

[VERIFY]

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[PIVOT]

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system
A machine can operate at various speeds, and some of the products it produces may have defects. The number of defective products produced per hour varies with the operating speed of the machine. Let $x$ denote the speed (in revolutions per second) and $y$ denote the number of defective products per hour. The following four pairs of observed values $(x, y)$ have been obtained: $(8, 5)$, $(12, 8)$, $(14, 9)$, $(16, 11)$.

1. Assuming a linear relationship between $y$ and $x$, find the regression line equation of $y$ on $x$.
2. If the maximum allowed number of defective products per hour in actual production is 10, what should be the maximum speed of the machine (in revolutions per second)? (Round your answer to the nearest revolution per second)

(Reference formula: $$\begin{cases} \hat {b}= \frac { \sum\limits_{i=1}^{n}(x_{i}- \overset{ -}{x})(y_{i}- \overset{ -}{y})}{ \sum\limits_{i=1}^{n}(x_{i}- \overset{ -}{x})^{2}}= \frac { \sum\limits_{i=1}^{n}x_{i}y_{i}-n \overset{ -}{x} \overset{ -}{y}}{ \sum\limits_{i=1}^{n} x_{ i }^{ 2 }-n \overset{ -}{x}^{2}} \\ \hat {a}= \overset{ -}{y}- \hat {b} \overset{ -}{x}\end{cases}$$)

Present the answer in LaTex format: \boxed{Your answer}
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