Consider the function represented by the equation x – y = 3. What is the equation written in function notation, with x as the independent variable?

Solve x − y = 3 for y, since the function’s output depends on the independent variable x. Subtract x from both sides to get −y = 3 − x, then multiply by −1 to get y = x − 3. Therefore, the equation in function notation is f(x) = x − 3, choice D.

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