Electrical FE /EIT Exam Prep - Signal Processing 3: z-Transform on Difference Equation

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FE / EIT Exam Prep Series - Electrical Engineering
Note: the FE handbook does have the following z-transforms so you can infer the Time-Delay property but it should be stated explicitly for all shift values.
y[k-1] == z^(-1)*Y(z)
y[k-2] == z^(-2)*Y(z)
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[@farhanupaul]

You could have just use the given formula for shifting property

[@airbender9593]

Easier to remember like... Also, if you have a strong math background, then you would understand.