Slope of the Regression of X on Y

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Which of the following formulas gives the slope, $b$ , of the least-squares regression line for predicting $x$ from $y$ ?

$b = \frac{s_x}{s_y}$

$b = r * \frac{s_x}{s_y}$

$b = r * \frac{s_y}{s_x}$

$b = s_x - s_y$

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