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Let the plane 2x + 3y + z + 20 = 0 be rotated through a right angle about its line of intersection with the plane x – 3y + 5z = 8. If the mirror image of the point ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − 2 , 2 1 , 2 in the rotated plane is B(a, b, c), then :

1. 4 c 5 b 8 a − = =
2. 2 c 5 b 4 a − = =
3. 4 c 5 b 8 a = − =
4. 2 c 5 b 4 a = =

Correct answer: 4 c 5 b 8 a − = =

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