Find a discrete-state-variable representation for the system shown in Fig. P4.8-1. A discrete-state-variable description of the continuous-time system is given by

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E(s) T Digital filter 0.1z z-1 0.9 1 2 (k+ 1) = 0 0 0.9 0 (k)+ -1 0 0.5 ++ y (k)= [1 1.5 2.3 M(z) Fig. P4.8-1 Continuous plant and data hold x(*) Y(s) 1(k)