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For the systems below, determine "Time invariant/variant," "Linear/Non-linear" and "Causal/non-causal." Here x(t) is an input signal and y (t) is the output.  (a) y(t) = cos(t)x(3t)  (b) y(t) = x(t) + x(t-2) (c) y(t) = x(t/2)  (d) y(t) = dx(t)/dt?

For the systems below, determine "Time invariant/variant," "Linear/Non-linear" and "Causal/non-causal." Here x(t) is an input signal and y (t) is the output.  (a) y(t) = cos(t)x(3t)  (b) y(t) = x(t) + x(t-2) (c) y(t) = x(t/2)  (d) y(t) = dx(t)/dt?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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For the systems below, determine "Time invariant/variant," "Linear/Non-linear" and "Causal/non-causal." Here x(t) is an input signal and y (t) is the output. 
(a) y(t) = cos(t)x(3t) 
(b) y(t) = x(t) + x(t-2)
(c) y(t) = x(t/2) 
(d) y(t) = dx(t)/dt?

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