SAT Math Multiple Choice Question 601: Answer and Explanation

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Question: 601

1. If 6x + 9 = 30, what is the value of 2x + 3?

  • A. 5
  • B. 10
  • C. 15
  • D. 20

Correct Answer: B

Explanation:

B

Algebra (solving equations) EASY

6x + 9 = 30

To solve in one step, just divide both sides by 3:

2x + 3 = 10

Most students waste time solving for x, which will work, but takes longer:

6x + 9 = 30

Subtract 9:

6x = 21

Divide by 6:

x = 3.5

Evaluate 2x + 3 by

substituting x = 3.5:

2x + 3 = 2(3.5) + 3 = 7 + 3 = 10

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