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When a function is said to be one to one in terms of math this means that the function passes the horizontal and vertical line tests. Therefore, if you were to hold a pencil straight up and down and shifted it horizontally across the function, it would only cross the pencil at one spot at a time. Similarly, if you hold this pencil horizontally and move it up and down the function should also only cross the pencil in one place at the time.

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16y ago

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