What is a function?

A function is a rule which relates the values of one variable quantity to the values of another variable quantity, and does so in such a way that the value of the second variable quantity is uniquely determined by (i.e. is a function of) the value of the first variable quantity.

What is the relationship between x&y?

x the independent variable and y the dependent variable.

Is function a relation?

It is a relation as it has at least 2 variables with one of them depending on the other variable.

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