## Proof of the scaling property of an impulse function

I am presently taking my first course in signals and systems and I have been charged with proving the scaling property of the impulse function; that:

delta(a(t-to)) = 1/abs(a)*delta(t-to)

I am seriously miffed and need some help.
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 Well I messed around with it for a bit and found one way to do it- take the definition of the delta function before the limit- like this: 0 for x < -a delta(a, x) = 1/2a for -a < x < a 0 for x > a and substitude k(t-to) for x...you'll find after messing around with it that a gets pulled in by a factor of 1/k. The area becomes 1/k and but the function is not translated, and hence your property is proved, although how rigorous this would be considered by mathematical standards I don't know.

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