Set 5: Linear Equations (Intermediate)

**Choice B is the best answer.** Solve step by step: x = 6

Explanation

Answer: B

PROBLEM

Solve for x: 2x + 9 = 21

✓ Correct

Detailed Explanation

Choice B is the best answer. Solve step by step: x = 6

Why others are wrong:

A: 12 is incorrect because it does not satisfy the equation.

C: 5 is incorrect because it does not satisfy the equation.

D: 4 is incorrect because it does not satisfy the equation.