Slash chords in sheet music look like this:
Here’s a detailed tutorial on how to interpret slash chords on piano. This lesson includes insights into several ways that slash chords are used, such as indicating an inversion, implying a descending bass line, or a simply notating a fresh chordal sound.
Composers and songwriters can use the “slash chord idea” in their creative thinking. That is, the effect of playing any given chord over bass notes that are not the actual root of the chord opens up endless possibilities. Some of the thinking behind these possibilities is discussed in this lesson.