A swing rhythm can be created by tying together the first and second notes of a triplet. There are several different ways of writing swing rhythms. To understand them it is worth using one musical example written in various ways. First play example 70 which contains eighth note triplets.
Example 71 has the first and second notes of the triplet group tied. This gives the it a swing feel.
The two eighth note triplets tied together in example 71 can be replaced by a quarter note.
To simplify notation, it is common to replace the 6 with z, and to write at the start of the piece 6 = z as illustrated in example 73.
Examples 72, 73, and 74 sound exactly the same but are just written differently.