Set 10: Linear Equations

Explanation

Answer: A

If $12x - 9 = 3x + 18$ , what is the value of $x$ ?

✓ Correct

2.7

Detailed Explanation

Choice A is correct. Choice D is the correct answer. 1. Subtract 3 x: $9x - 9 = 18$ 2. Add 9: $9x = 27$ 3. Divide by 9: $x = 3$ 4. Verify: $12(3) - 9 = 27$ and $3(3) + 18 = 27$ ✓ Choice A 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 B is incorrect because it results from an error in the solution process.

Key Steps:

•

The correct answer is 3

Why others are wrong:

B: Choice B 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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