On can also derive the two Michaelis constants K_M^S=(k_{-1}+k_2)/k_1and K_M^P=(k_{-1}+k_2)/k_{-2}. The Haldane equation is the relation K_{\rm eq}=\frac{[{\rm P}]_{\rm eq}}{[{\rm S}]_{\rm eq}}=\frac{V_{\rm max}^f / K_M^S}{V_{\rm max}^b / K_M^P}.
