Determine whether the given CT system is linear or not.

$y(t)=xsin(t)$

$y(t)=sinx(t)$

$y(t)=t^{2}2x(t-1)$

$y(t)=e^{x(t)}$

Answers:

$1.$Linear

$2.$ Nonlinear

$3.$ Linear

$4.$ Nonlinear