Solution
= Solution
Invert the stated expression:
$$
\frac1\Gamma=\frac{1+bC}{\Gamma_\infty bC}
=\frac{1}{b\Gamma_\infty}\frac1C+\frac1{\Gamma_\infty}.
$$
Hence the line of $1/\Gamma$ against $1/C$ has slope $M=1/(b\Gamma_\infty)$ and intercept $1/\Gamma_\infty$. Their ratio gives $b=(\mathrm{intercept})/(\mathrm{slope})$.