Solve the system: and , where .

Answer and explanation

Correct answer: A. and

  1. Step 1: Let and .
  2. Step 2: and .
  3. Step 3: Multiply first by 4, second by 3: and .
  4. Step 4: Add: .
  5. Step 5: Substitute: .
Answer
and .
Why not the others: forgets to invert and ; swaps and ; and negative root has wrong sign.

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