Solve the system: and , where .
Answer and explanation
Correct answer: A. and
- Step 1: Let and .
- Step 2: and .
- Step 3: Multiply first by 4, second by 3: and .
- Step 4: Add: .
- 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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