Example

Example: Determining if the Equation 4x+y=34x + y = -3 Defines a Function

Consider the equation 4x+y=34x + y = -3. To determine if it defines a function with xx as the independent variable, solve for yy by subtracting 4x4x from both sides, yielding y=4x3y = -4x - 3. For any value substituted for xx, multiplying by 4-4 and subtracting 33 produces exactly one corresponding value for yy. Because each value of xx corresponds to exactly one value of yy, the equation 4x+y=34x + y = -3 defines a mathematical function.

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Updated 2026-05-06

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