Watch the Funkin' It Up online guitar lesson by Brad Carlton from Chord Studies: Slash Chords Vol. 2
Here we have an R&B style progression with a constant A note in the bass. In the first chord, we have our 7th of the chord in the bass, and the tension created here is resolved when we move down to the C/A. We then move back to our first chord, and then move up to get a Cmaj7/A, which could also be thought of as an Am9. Feel free to get funky with the rhythm here!