Question 8 Answer & Explanation - SAT Algebra

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algebra

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

2.7

Correct Answer: A

Choice Dhoice D is the correct answer.

Subtract 3x: $9x - 9 = 18$
Add 9: $9x = 27$
Divide by 9: $x = 3$
Verify: $12(3) - 9 = 27$ and $3(3) + 18 = 27$ ✓

Choice Dhoice A is incorrect because calculation error.

Choice Dhoice C is incorrect because calculation error.

Choice Dhoice B is incorrect because calculation error.

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