College Math CLEP Prep Practice Exam

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What is the domain of the function y = 3x + 4?

  1. All real numbers

  2. All whole numbers

  3. All positive real numbers

  4. All negative real numbers

The correct answer is: All real numbers

The correct domain for the given function, y = 3x + 4, is all real numbers. This means that any number, positive or negative, whole or decimal, can be inputted into the function and a corresponding output will be generated. Option B, all whole numbers, is incorrect because the function allows for decimal inputs. Option C, all positive real numbers, is incorrect because the function also allows for negative inputs. Option D, all negative real numbers, is incorrect for the same reason - the function includes positive number inputs as well. Therefore, the best choice for the domain of this function is option A, all real numbers.

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