My ti-84 is only graphing one linear equation in the y equal when i put two equations in it only show one

The following should help you draw several graphs.
When you enter a function you should press [ENTER] to validate. At the same time, the cursor moves to the next line. Verify that the = sign on the equation already entered is still highlighted.
If for some reason the = sign of an equation is no longer highlighted, use arrow keys to move cursor on the = sign and press [ENTER].

If only one = sign remains highlighted and all others are not, then in all probability the application Transfrm has been executed before and is still lingering in RAM. When in RAM, it takes over the graphing capabilities of the native OS. This prevents you from drawing more than one graph.You must unload it from memory.

1. Press the [APPS] key.
2. Scroll down to the line that shows Transfrm.
   
3. Highlight it and press [ENTER].
4. In following screen you are invited to Uninstall or continue.
5. Press the number to the left of Uninstall. Validate if need be.
6. Return to the Y= editor to type in functions to graph.