In this situation I have two lines. For the sake of the question I will simplify the two lines to simple linear equations. $$f(x) = x + 1$$ $$g(x) = x + 2$$
$f(x)$ and $g(x)$ were linearly regressed using least sum of squares. If the R$^2$ value of $f(x)$ is $0.5$ and the R$^2$ value of $g(x)$ is $0.7$, what is the R$^2$ value of the result of $\frac{f(x)}{g(x)}$?