I am using an equation of the following form:
$\ln{cY} = -\frac{X}{a} + b$$$\ln{cY} = -\frac{X}{a} + b$$
I am interested in $a$, which is related to the slope of the plot $\ln{cY}$ versus $X$. If I can generate this plot and I know $\sigma_{Y}$, the error in $Y$, how can I find the resulting error in $a$?