According to my math book, in order to find the intersecting line between two planes we need to:
- Find the vector product of the direction normals of the two planes
- Write the equations of the planes in Cartesian form.
- Assume that $z=0$ since the line has to intersect this plane.
- Solve simultaneously for a point on the line and write down a vector equation of the line
What is meant by point 3? I'm having problems visualizing it. Please be explicit.