Example

Example: Determining if the Equation y=5x4y = 5x - 4 Defines a Function

Consider the equation y=5x4y = 5x - 4 where xx is the independent variable. Because the equation is already explicitly solved for yy, it is evident that for any value substituted for xx, multiplying it by 55 and subtracting 44 outputs exactly one corresponding value for yy. Since each value of xx yields exactly one unique value of yy, the equation y=5x4y = 5x - 4 defines a function.

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Updated 2026-05-06

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