Answer:
How you can tell
Explanation:
A function assigns exactly one output to each input: x/input y/output
How they work: X can not repeat but Y can.
Lets see your problem, there are no inputs repeating and the outputs are fine.
That is a function!
To know if it is a function see if there are two of the same x-intercept( which makes a vertical line). If there is,then it is not a function.
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