Plane equation question!

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Could anyone explain me how to do tasks like this one:

Plane is intersecting Oy axis when $y = 3$ and line equation is $ 2x + 4= y-2=z$ belonds to plane.

Write plane equation.

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find 3 points which belong to plane. The first is $(0,3,0)$. if a line belongs to plane then all its points belong to plane. Since points $(-2,2,0)$ and $(2,10,8)$ belong to the line $ 2x + 4= y-2=z$ . We have the 3 points which belong to the plane. Formula on http://en.wikipedia.org/wiki/Plane_(geometry) (Defining a plane through three points) helps you write plane equation.

I am sorry for my English