Hey bastiante.
Can you show us what you have tried? (Hint: If it goes through both planes then the area of intersection will be where P1 = P2 or Plane1 = Plane2).
Equation of system of planes containing the line of intersection of the two planes:
Expanding and collecting terms planes are:
Distance of point (0,0,0) from these planes:
Solve to find k={1, -47/139}. Hence equation of two planes with distance 3 and containing line of intersection of the two given planes are:
and:
NB.: Check the 2 planes if both are solutions