Sarah bought 3 pencils and 2 erasers for $7. John bought 2 pencils and 4 erasers for $8. What is the cost of one pencil?

✓ Correct Answer: Option B

Let 'p' be pencil cost and 'e' be eraser cost. Equations: 3p + 2e = 7 and 2p + 4e = 8. Multiply the first by 2: 6p + 4e = 14. Subtract the second: (6p + 4e) - (2p + 4e) = 14 - 8, which simplifies to 4p = 6. Thus, p = $1.50.