The plane 4x + 7 y + 4z + 81 = 0 is rotated through a right angle about its line of intersection with the plane

### Question Asked by a Student from EXXAMM.com Team

Q 2116223179.     The plane 4x + 7 y + 4z + 81 = 0 is rotated through a right

angle about its line of intersection with the plane

5x + 3y + 10z = 25. The equation of the plane in its new

position is x - 4y + 6z = k, where k is
A

106

B

-89

C

73

D

37

#### HINT

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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