Texas Instruments TI-84 Plus Manual Book page 186

To simultaneously display two dependent variables on the table that are not defined
Note:
as consecutive Y= functions, go to the Y= editor and deselect the Y= functions between
the two you want to display. For example, to simultaneously display Y4 and Y7 on the
table, go to the Y= editor and deselect Y5 and Y6.
Chapter 7: Tables 183