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For the system of linear equations 2x + 4y + 2az = b x + 2y + 3z = 4 2x – 5y + 2z = 8 which of the following is NOT correct ?

1. It has unique solution if a = b = 6
2. It has infinitely many solutions if a = 3, b = 6
3. It has infinitely many solutions if a = 3, b = 8
4. It has unique solution if a = b = 8

Correct answer: It has infinitely many solutions if a = 3, b = 6

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