To explain: How a function relates one variable to another using the terms domain, range, independent and dependent variables.
A function can be defined as, for every independent variable in domain there exist a unique dependent variable in range.
Function is a collection of well defined objects such that for every element in domain there exists a unique element in range.
Consider a function . In which the set of all x values are called the domain and the set of all y values are called the range.
Since y is a function of x, x is called independent variable and y is called the dependent variable.
Therefore, the value of y changes as x changes.
Hence, the function can be expressed as, for every independent variable in domain there exist a unique dependent variable in range.
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