Texas Instruments TI-83 PLUS - Manual (Page 568)

TI-83 Plus Activities 565
3. Press p and set Xmin= L 2 , Xscl=10 , Ymin= L 5 , and Yscl=10 . Ignore
Xmax and Ymax ; they are set by @ X and @ Y in step 4.
4. Press y 5 to return to the home screen. Store 1 to @ X , and then
store 5 to @ Y . @ X and @ Y are on the
VARS Window X/Y
secondary menu.
@ X and @ Y specify the horizontal and vertical distance between the
centers of adjacent pixels. Integer values for @ X and @ Y produce nice
values for tracing.
5. Press r to plot the function. At what speed does the ticket
exceed 250?