SAT Math Multiple Choice Question 763: Answer and Explanation

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Question: 763

13. Images

Given the formula above, which of the following expresses k in terms of a and b?

  • A. Images
  • B. Images
  • C. Images
  • D. Images

Correct Answer: A

Explanation:

A

Algebra (linear equations) MEDIUM

Original equation:

Images

Multiply by b + k:

a + k = -2(b + k)

Distribute:

a + k = -2b - 2k

Subtract k:

a = -2b - 3k

Add 2b:

a + 2b = -3k

Divide by -3:

Images

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