If y varies directly with x and y = 12 when x = 4, what is y when x = 7?

A 21

B 28

C 3

D 84

✓ Correct Answer: Option A

Direct variation: y = kx. 12 = k(4) → k = 3. When x = 7: y = 3(7) = 21.

💡 Why is A) the correct answer?

The correct answer to the question "If y varies directly with x and y = 12 when x = 4, what is y when x = 7?" is Option A: 21.

The other options — B) 28, C) 3, D) 84 — are incorrect for this SAT Exam Prep question. As explained above: Direct variation: y = kx. 12 = k(4) → k = 3. When x = 7: y = 3(7) = 21.

📚 About This SAT Exam Prep Practice Question

This 2-level SAT Exam Prep question from the Math (No Calculator) topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free SAT Exam Prep practice test or use flashcards for spaced repetition review.

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If y varies directly with x and y = 12 when x = 4, what is y when x = 7?

✓ Correct Answer: Option A

📚 About This SAT Exam Prep Practice Question

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