College Algebra CLEP Prep Practice Exam

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Which of the following equations is an Identity?

  1. x + 1 = 3

  2. x + 1 = 1

  3. 3x + 1 = 3x

  4. 3x + 1 = 3

The correct answer is: 3x + 1 = 3x

An identity equation is one in which the variable can take on any value and the statement will still be true. In option A, x = 2, but in option B, x can be any number. In option D, x = 0, but in option C, x can be any number. Therefore, option C is the only identity equation as it holds true for all values of x.

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