after RREF

I know S is linearly dependent because the third vector is a combination of the first two.

Describe in words what the span S looks like geometrically?

I think it is...

The span S is a plane that contain the vectors and the zero vector.

Is this correct?

Find an implicit description for the span of S?

would this just be

after a bit of reading, above would the the explicit description of span s. The implicit description would be equation of the plane.