In the following determine whether the given planes are parallel or perpendicular, and in case they are neither, find

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

Q 1815856760.     In the following determine whether the given
planes are parallel or perpendicular, and in case
they are neither, find the angle between them.
(a) 7x + 5y + 6z + 30 = 0
and 3x - y - 10z + 4 = 0
(b) 2x + y + 3z - 2 = 0 and x - 2y + 5 = 0
(c) 2x - 2y + 4z + 5 = 0
and 3x - 3y + 6z - t = 0
(d) 2x - y + 3z - 1 = 0 and 2x - y + 3z + 3 = 0
(e) 4x + 8y + z - 8 = 0 and y + z - 4 = 0.

#### HINT

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