Three Dimensional Geometry | Equation of a Plane

Equation of a plane parallel to xz plane at unit distance is 
The locus of a point P(x, y, z) which moves in such a way that z = 7 is a
Find the equation of the plane which is parallel to the plane 2x - 3y + z + 8 = 0 and which passes through the point (- 1, 1,2)
Which of the following is NOT a known factor to uniquely determine a plane?
What is the equation to the plane through (1, 2, 3) parallel to 3x + 4y - 5z = 0?
Ads