Petty concept forgotten

hello guys,
Plz show me theoritically how this system: y(t) = x(2t) is linear(i.e it has the properties of scaling and superposition) and also how it is
non casual.
Thanks
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On Thu, 19 Jul 2007 01:50:30 -0700, Ady wrote:

If you can understand the explanation, you can do the tests yourself. Plug it into the expression for superposition and see if it's true (note: if superposition holds, so does scaling). Then see if the system shows an output before it gets an input to show it's non causal.
--
Tim Wescott
Control systems and communications consulting
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