Set 9: Linear Equations

Explanation

Answer: B

Solve: $3x - 9 = x + 3$

✓ Correct

Detailed Explanation

Choice B is correct. Choice B is the correct answer. 1. Subtract x: $2x - 9 = 3$ 2. Add 9: $2x = 12$ 3. Divide by 2: $x = 6$ 4. Verify: $18- 9 = 9$ and $6+ 3 = 9$ ✓ Choice C is incorrect because it results from an error in the solution process. Choice C is incorrect because it results from an error in the solution process. Choice D is incorrect because it results from an error in the solution process.

Key Steps:

•

The correct answer is 6

Why others are wrong:

A: Choice A is incorrect and may result from a calculation error.

C: Choice C is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

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