Question 3 Answer & Explanation - SAT Algebra

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algebra

Solve: $6x + 3x = 18$

Correct Answer: D

Choice Ahoice C is the correct answer.

Combine like terms: $9x = 18$
Divide by 9: $x = 2$
Verify: $6(2) + 3(2) = 12 + 6 = 18$ ✓

Choice Ahoice D is incorrect because $18/6 = 3$ .

Choice Ahoice C is incorrect because $18/3 = 6$ .

Choice Ahoice D is incorrect because calculation error.

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