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

** Q 1875612566. ** In each of the following exercises, determine

the direction cosines of the normal to the plane

and the distance from the origin.

(a) `z = 2`

(b) `x + y + z = 1`

(c) `2x + 3y - z = 5`

(d) `5y + 8 = 0`