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Let the system of linear equations – x + 2y – 9z = 7 – x + 3y + 7z = 9 – 2x + y + 5z = 8 – 3x + y + 13z = λ has a unique solution x = α , y = β , z = γ . Then the distance of the point ( α , β , γ ) from the plane 2x – 2y + z = λ is-

1. 11
2. 7
3. 9
4. 13

Correct answer: 7

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