Which of the following is a function? Justify your answer. Number 1 is done for you.
1) = 2 + 1
Answer: Yes, because when is replaced by any number, then will have a distinct value. Suppose = 3, then = 7. If = −1, then = −1. If = 1 2 , then = 2. No value of will make the value of more than one.
2) = 2 − 6
3) = −6 − 1
4) 2 + 2 = 16
5) = 4

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