Question 6 Answer & Explanation - SAT Algebra

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algebra

If $3(x + 4) = x + 18$ , what is the value of $x$ ?

Correct Answer: B

Choice Choice B is the correct answer.

Distribute: $3x + 12 = x + 18$
Subtract x: $2x + 12 = 18$
Subtract 12: $2x = 6$
Divide by 2: $x = 3$
Verify: $3(7) = 21$ and $3 + 18 = 21$ ✓

Choice Choice C is incorrect because calculation error.

Choice Choice A is incorrect because calculation error.

Choice Choice D is incorrect because calculation error.

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Linear Functions Set 18

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