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A function is given by a table of values, a graph, a formula, or a verbal description. Determine whether it is one-to-one.

x      1     2     3     4     5     6
f(x) 1.5  2.0  3.6  5.3  2.8  2.0

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Because the definition of a one-to-one function requires that f(x_1) =/= f(x_2),
In other words every value of x must have a unique value of f(x).

We see that is not the case because f(2) and f(6) both equal to 2.0
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