Advanced Math practice question

Answer: A. 6x + 12y

Multiply each term by 3: 6x + 12y.

Why the other answers are wrong

B. 6x + 4y

The 4y must be multiplied by 3 too.

C. 5x + 7y

This adds 3 to each coefficient.

D. 6x + 7y

This adds 3 to 4y instead of multiplying.

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