Without seeing the table I need to explain what to look for. First if the list of what goes into the equation, usually the x, doesn't repeat then it is a function. If it does repeat it MUST give you the same answer for the y. It's like questions and answers. If the question is repeated then the answer must be the same or the interviewee is telling a lie.
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Input/output table, description in words, Equation, or some type of graph
A mapping diagram can be used to represent a function or a relation true or false?
Use this cordinate ,find the other cordinate that makes the ordered pair a solution of the given equation: x+4y=7,(_,3)
table represent the value that are inserted during the user using that website
If a vertical line passes through the supposed function at only one spot then you have a function.