Deleted y column in TABLE

There is no such thing as a TI89 Plus Silver Edition.

If you mean the TI-89 or TI-89 Titanium, press diamond / (the diamond key below the 2ND key, then the divide key).

If you mean the TI-83 Plus Silver Edition or the TI-84 Plus Silver Edition, press MATH left-arrow 4 .

1147763

See if your setting are on degree or radian settings.

Just return to the Y= function editor and type your function again. Press Graph or 2nd GRAPH and you will find your table.

First exit out of any applications and make sure you are at the home screen. You can do this often by pressing "2nd" then "Mode" to quit or by pressing "Clear." Then, press the blue button titled "2nd" and then hit enter. The most recent thing you have entered in the calculator will appear on the screen. Doing this again will give you the second most recent, then the third and etc. Good luck!

2ND [MEM] 2 7 then move to the program in question, then DEL.

From the TI knowledge base and FAQ

How do I correct ERR: MEMORY on a TI-83 family or TI-84 Plus family graphing calculator?

An ERR: MEMORY is given when there is not enough memory to perform the instruction or function. To increase available memory by deleting the contents of any variable (real or complex number, list, matrix, Y= variable, program, Apps, AppVars, picture, graph database, or string), follow these steps. • Press [2nd] [MEM] to display the MEMORY menu.
• Press 2: Mem Mgmt/Del.
• Select a variable or data that needs to be deleted and press [ENTER].
• Use the arrow keys to move the cursor next to the item, and then press [DEL]. The variable or data should now be deleted from the memory.
When deleting programs or Apps, a message asking for confirmation will appear. Select 2:Yes to continue. To leave any variable screen without deleting anything, press [2nd] [MODE].
Notes:
With the exemption of programs and Apps, no warning will be given to verify the deletion.Some system variables, such as the last-answer variable Ans and the statistical variable RegEQ, cannot be deleted.

Hope it helps.

"2nd" + "log"

try going into the memory men (2ND - +), and selecting option 2.  Delete some stuff you know you don't need.  If the problem persists, 2ND - +, this time option 7.  Reset the defaults.  You won't lose anything, it will just reset the settings that may be causing this issue.

You actually don't need to restore factory settings for this. I did it accidently and fixed it quickly.

Go to Stat > Edit...

Scroll over until at the bottom of the screen it asks for a name. Press 2nd > 1. L1 should appear, so now, just press enter.

Or just go to Stat > SetUpEditor...