A function is a rule that assigns each value of the <u>independent</u> variable to exactly one value of the dependent variable.
Step-by-step explanation:
We have been an incomplete statement. We are asked to complete the given statement.
We know that a function is a relation between two sets. A relation is known as function when each input in the domain has exactly one specific corresponding output.
We also know that independent variable is known as input of function and dependent variable is known as output of function.
Therefore, the correct word for given statement would be independent variable.
