# SAT Math Multiple Choice Question 171: Answer and Explanation

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**Question: 171**

**6.**

If the equation above has infinitely many solutions for d, what is the value of a ?

- A. -10
- B. 10
- C. 15
- D. 20

**Correct Answer:** B

**Explanation:**

B The question states that there are infinitely many solutions to the equation. That means any real number should work for d. Plug in an easy number like 0 for every d in the equation to get . Simplify the equation to = , so a = 10, which is (B).