relation may not a function examples ?
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Example 1: Is A = {(1, 5), (1, 5), (3, -8), (3, -8), (3, -8)} a function? Solution: If there are any duplicates or repetitions in the X-value, the relation is not a function.
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the graph of y = +/- sqrt(x) would be a relation because each value of x can have more than one value of y. this occurs everywhere except at the vertex of the graph. you can see that this graph has 2 values of y for each value of x except at the vertex which is at x = 0.
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