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explain how to determin from a list of ordered pairs whether or not a relation is a function.?

the question askes it all.

Public Comments

1. If there are points that have the same x-coordinate then that means that the function won't pass the vertical line test. One vertical line will intersect the function twice.
2. a relation is a function when each x has only one y. meaning the relation that generates { (1,1) , (2,2), (2,3), (3,4)} is notg a function since f(2) = 2 and 3.