SAT Math Multiple Choice Question 70: Answer and Explanation

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Test Information

Question: 70

10.

In the equation above, what is the value of d ?

  • A. -4
  • B. 2
  • C. 4
  • D. 6

Correct Answer: C

Explanation:

CWhenever the question includes variables and the answer choices are numbers, think Plugging In the Answers. In (A), d = -4, and the equation becomes . Solve both sides of the equation to get , or = . Reduce both fractions to get -13 = -5. This is not true, so eliminate (A). In (B), d = 2, and the equation becomes . Solve both sides of the equation to get , or = . Reduce both fractions to get = . Eliminate (B). In (C), d = 4 and the equation becomes . Solve both sides of the equation to get , or = . Reduce both fractions to get = . The correct answer is (C).

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