# Two Planes Intersecting in a Line

- Author:
- Kara Babcock

- Topic:
- Planes

If two planes are not parallel nor coincident, then they must intersect along a line.
In this example, the planes are

*x*+ 2*y*+ 3*z*= -4 and*x*-*y*- 3*z*= 8. The dotted line represents the line of intersection of these two planes.What are the normal vectors of each plane?

How many points of intersection are there between these planes?