Texas Instruments TI-83 - Page 80

Here is what you should see on your screen:
Now press the X,T,
θ
,n button, followed by + 3 ALPHA 1
After hitting ENTER, you should have the following on your
screen:
(d)With the values of x and y still stored in memory, from the
HOME screen press the MATH
button and scroll to the right to
highlight NUM:
Store
button
ALPHA
This is the
“negative”
button.
Notice the
green Y above
the 1.
X,T,
θ
,n