2.1 For each of the following systems, specify whether or not the system is: (i) linear and/or (ii) time-invariant. (a) y(t)=3x(t) +1 *(b) y(t)=3 sin(t) x(t) (c) +1 y(t) = x(1) (d) +2y(t) = 3 dr (e) y(t) = x(t) dr (f) y(t) = x(t) dr (g) y(t) = x(t) dr 2.2 For each of the following systems, specify whether or not the system is: (i) linear and/or (ii) time-invariant. (a) y(t)=3x(1-1) (b) y(t) = x(t) (c) (d) +y(1-1) = x(1) +2y(1) = x(t) dr (e) y(t) = x(t) u(t) ∞ (f) y(t) = x(r) dr (g) y(t) = x(t) dr