1.1 A system has an input u(t) and an output y(t) , which are related by the information provided below. Classify each system as linear or nonlinear and time-invariant or time-varying.

a) y(t) = 0 forall t.

b) y(t)=a, a;tO,forall t.

c)

d)

e)
f)

ji(t) + 3e -t y(t) + y(t) = u(t).
g)

ji(t)+(l-/(t))y(t)+m2 y(t) = u(t), OJ= constant ;t 0.

(1)n D y(t),