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It usually represents a part of a whole.
Your age is a linear function (of time).
No. For example, linear algebra, for example, is about linear equations where the domain and range are matrices, not simple numbers. These matrices may themselves contain numbers that are real or complex so that not only is the range not the real numbers, but it is not based on real numbers either.
Loss or negative growth, mostly in economic matters temperature
An overdrawn balance on your bank account is a negative number !