SAT Math Multiple Choice Question 661: Answer and Explanation

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Question: 661

1. a - b = 10

a - 2b = 8

Based on the system of equations above, what is the value of b?

  • A. -2
  • B. -1
  • C. 1
  • D. 2

Correct Answer: D

Explanation:

D

Algebra (systems) EASY

When faced with a system of equations, notice whether the two equations can be combined in a simple way-either by subtracting or adding the corresponding sides-to get the expression the question is asking for.

a - b = 10

a - 2b = 8

Subtract corresponding sides:

b = 2

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