Solve for x: 3x = 9.

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Prepare for the Certify Teacher EC-6 (391) Mathematics Exam. Utilize multiple choice questions, flashcards, and explanations to excel in your assessment. Gear up for success!

Multiple Choice

Solve for x: 3x = 9.

Explanation:
Isolating the variable by using inverse operations is what this asks you to do. In the equation 3x = 9, x is being multiplied by 3. Undo that multiplication by dividing both sides by 3, which gives x = 9 ÷ 3 = 3. You can check your work by substituting back: 3 times 3 is 9, which matches the original equation. The other values would not satisfy 3x = 9 because they would yield 3, 6, or 12 instead of 9.

Isolating the variable by using inverse operations is what this asks you to do. In the equation 3x = 9, x is being multiplied by 3. Undo that multiplication by dividing both sides by 3, which gives x = 9 ÷ 3 = 3. You can check your work by substituting back: 3 times 3 is 9, which matches the original equation. The other values would not satisfy 3x = 9 because they would yield 3, 6, or 12 instead of 9.

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