Question: differential equations

Problem Statement: In a catalytic reaction that follows a mechanism known as the Michaelis-Menten kinetics, the reactant (S) combines reversibly with a catalyst (E) to form a complex (ES) with a forward and reverse rate constant of k₁ and k_i, respectively. The complex then dissociates into product (P) with a reaction rate constant of k₂ and the catalyst is regenerated.

            k1     k2
    E + S <---> ES --> E + P
            ki
  where E  = enzyme (i.e., catalyst)
        S  = substrate (i.e., reactant)
        ES = enzyme-substrate complex')
        P  = product
        k1, ki, k2 = elementary reaction rate constants

The following ODEs describe how the concentration of each of the four species (E, S, ES, P) changes with time.

       dE/dt  = -k1*E*S + ki*ES + k2*ES
       dS/dt  = -k1*E*S + ki*ES
       dES/dt =  k1*E*S - ki*ES - k2*ES
       dP/dt  =  k2*ES

Integrate the above set of equations with the following rate constants and initial conditions:

      k1 =  1
      ki =  1
      k2 = 10
      E(0)  = E0  = 0.1
      S(0)  = S0  = 1.
      ES(0) = ES0 = 0.
      P(0)  = P0  = 0.

1) How do I solve those four in maple?? (tried searching in help, can't write equations correctly keep getting errors even with implicitdiff every example I try works fine.

2) I need to solve and find S(t)

3) How to express S(t) in matchematical rows in maple