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# What is a function rule in mathematics?

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A function is a relationship in math between two variables, often x and y, and for every value of x there is exactly one value of y. The x value is referred to as the independent variable and the y as the dependent variable.

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The term f(x) is often used to represent a function. One example of a function is: f(x) = x + 2. This means that for each value of x, f(x), also know as the y value, is "x + 2". The value of y depends on the value of x. A graph is a function if it passes something called the vertical line test. If a vertical line can be drawn at any point and only pass through the graph once, then the graph is a function.

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