How do I find the equations of the planes containing the faces of this tetrahedron?

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The points are $(0,0,2), (0,2,0), (0,0,0),$ and $(4,2,0)$. I know the y and z components of the equation will just be the intercepts but I'm not sure how to incorporate the $(4,2,0)$ point. I need the equations to calculate the flux using the divergence theorem.