How to know if a function is one to one

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How do you determine if a function is one to one? [Solved]

Sorted by: 16. Yes, your understanding of a one-to-one function is correct. A function is onto if and only if for every y in the codomain, there is an x in the domain such that f ( x) = y. So in the

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One-to-One Functions

1) Horizontal Line testing: If the graph of f(x) passes through a unique value of y every time, then the function is said to be one to one function. For example Let f(x) = x 3 + 1 and g(x) = x 2 - 1 . In the above graphs, the function f (x) has only