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We will learn the difference between a function and a relation.
A function is a relationship between an independent variable, x, and a dependent variable, y, such that for each value of x there is only one corresponding value of y.
A relation is a relationship between the variables x and y such that each value of x there may be one or more values of y.

Next video in this series can be seen at:
https://youtu.be/r7DnmUnqBYo