The Trace Feature; Changing The Dimensions Of The Viewing Window; Scale Marks - Texas Instruments TI-83 Manual

The TRACE Feature

Find points on the graph of the previous example. Re-
4 3 2
call y = x 12x + x
After graphing the function press the
Solution.
TRACE key. A blinking star-like cursor will be sitting
on a point of the graph.
At the bottom you see x = 0 and y =
that the point (0, 2) lies on the graph. You can move
the cursor by using the ¡ and £ keys. For example,
by pressing the £ key you obtain
This means that
(0.21276596, 2.068263) is on the graph.
2.
2. This means
the (approximate)
Change the Dimensions of the Viewing Window
4
Graph y = x
mensions [ 5, 14] by [ 2500, 1000]. (This is the second
part of Example 1 in the text).
Solution. Press the WINDOW key and you see
Press the
down to the 10 after Xmin.
Press the keys ( )
(The ( ) key is used to change the sign, whereas the
key is used to subtract two quantities.)
Press the ENTER key. The blinking cursor drops
to the 10 after Xmax.
Press the keys 1 4 . This changes 10 to 14
Notice that Xscl is 1. This means the tick marks on
the x-axis are set at 1 unit. We will not change this.
Press the ENTER key twice. The blinking cursor
drops to the 10 after Ymin.
Press the keys
to 2500.
Press the ENTER key. The blinking cursor drops
to the 10 after Ymax.
Press the keys 1
1000.
Press the ENTER key. The blinking cursor drops
to the 1 after Yscl. We need to set the tick (scale)
marks on the y-axis to a much larger number, say 500.
point
So press the keys 5 0 0 ENTER .
You should see the following.
35
3 2
12x + x 2 using a window with di-
key and the blinking cursor moves
5 . This changes
2 5 0 0 . This changes
0 0 0 . This changes 10 to
10 to 5.
10