College Math CLEP Prep Practice Exam

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What is the solution to the equation 4x + 9 = 21?

The correct answer is: 6

To find the solution to the equation 4x + 9 = 21, first isolate the variable by subtracting 9 from both sides of the equation. This leaves us with 4x = 12. Then, divide both sides by the coefficient of x, which is 4, to solve for x. Thus, the solution to 4x + 9 = 21 is x = 3. Option A is incorrect because it is the value of the coefficient, not the solution. Option B is also incorrect because it is not the correct solution when the equation is solved correctly. Option D is not the correct solution as it does not satisfy the given equation when plugged in for x.