Unfortunately, the browser used by Answers.com for posting questions is incapable of accepting mathematical symbols. This means that we cannot see the mathematically critical parts of the question. We are, therefore unable to determine what exactly the question is about and so cannot give a proper answer to your question. However, I suspect that the answer is in the negative.
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If you mean: y = 2x+5 then yes it is a linear function of straight line
No, f(x) = x + x^5 in not linear.
The linear equation x=5 or any other number is a vertical line. There are more than one possible answer for y. Therefore it is not a function.
Only if it's a function.
Your age is a linear function (of time).