3.1. A number of discrete-time systems are specified below in terms of their input-output relationships. For each case determine if the system is linear and/or time-invariant. y/n] = r[n] u[n] y/n] = 3 x[n] + 5 y/n] = 3 x[n] + 5 u[n] y[n] = n x[n] y[n] = cos(0.2Tn) ¤[n] y[n] = x[n] +3x[n – 1] y[n] = x[n] +3x[n – 1] c[n – 2] a. %3D b. с. d. e. %3D f. g.

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