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4) a) Describe what is meant when one says that a system is linear. Use mathematical...

4) a) Describe what is meant when one says that a system is linear. Use mathematical expressions to describe.

b) Describe what is meant when one says that a system is time invariant. Use mathematical expressions to describe.

c) Show that the following systems are non-linear:

i) y(t) = x(t) + 2

ii) y(t) = (x(t))^2

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