If 3x + 1y = 25 and 3x + 4y = 46, what is x + y?

Answer and explanation

Correct answer: A. 13

  1. Step 1: Solve the pair by elimination: x = 6, y = 7.
  2. Step 2: x + y = 13.
Answer
13.
Why not the others: 6, 7 and 42 do not fit.

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