We start our analysis with the coupled auxiliary enzyme reaction mechanism represented by the chemical equations ( )-( ), which consists of a single-substrate, single-enzyme non-observable reaction followed by another single-substrate, single-enzyme observable reaction (indicator reaction). In this mechanism, the product of the non-observable reaction becomes the substrate of the indicator reaction. By applying the law of mass action to (1)-(2), we obtain a nonlinear system of differential equations with three conservation laws . We begin our analysis by scaling the mass action equations.