In our stats lecture it was stated that the OLS regression line equation: $Y = a + bX$ can also be expressed as:
$$ \frac{y-\bar y}{s_y} = r_{xy} \frac{x-\bar x}{s_x} $$
Where are $\bar{x}$ and $\bar{y}$ are means, $s_x$ and $s_y$ are standard deviations, and $r_{xy}$ is the correlation coefficient.
Can someone explain to me how?
