What is applicable only for linear systems?

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What is applicable only for linear systems? Answer: Principle of superposition

The principle of superposition and the concept of a constant rate of change are applicable only to linear systems. Superposition states that the response to a sum of inputs is the sum of the responses to each individual input, and it is a fundamental property used in areas like digital signal processing. A constant rate of change is a key feature in the real-world applications of linear equations, such as calculating speed or cost.