1) Examine the properties of the following systems, i.e. linear/non-linear, time- variant/time-invariant, causal/non-causal, stable/unstable, with or without memory. a) y(t) = 2x(t) – 3 b) y(t) = e¯¹x(t) c) y(t) = (t + 2)x(t)

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