a) Describe the shape of the intersection of the plane z=-3 and the plane y=z in three-space.
b) list all the possibilities for the intersection of a line and a plane, and draw an example of each.
help is much appreciated
If two planes are not parallel then they will intersect in a straight line.
The given planes are not parallel therefore you'll get a straight line as the intersection between them:
to b): Let l denote the line and p the plane then