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____ systems are defined by differential equations with variable coefficients that describe the input-output relationship

31. ____ systems are defined by differential equations with variable coefficients that describe the input-output relationship.

1. Time-variant
2. Time-invariant
3. Linear
4. Automatic

Answer: A) Time-variant

Explanation:

Time-variant systems are defined by differential equations with variable coefficients that describe the input-output relationship.