6 . The three planes 2x � y �3z � 3 , x � 4y �6z
� � 17 and 3x � y � 2z
� 21 meet at a point P .
( a ) Find the coordinates of P .
( b ) Hence , write down the vector equation of the line passing through P and perpendicular to the plane x � 4y �6z
� � 17 .
[ 4 ]
[ 2 ]
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