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TI-83 Plus Activities 569
3. Press
q
~
4
to select
4:SetFactors
from the
ZOOM MEMORY
menu.
Set
XFact=10
and
YFact=10
.
4. Press
q
2
to select
2:Zoom In
. Use
|
,
~
,
}
, and
†
to move the
free-moving cursor onto the apparent intersection of the functions on
the right side of the display. As you move the cursor, notice that the
X
and
Y
values have one decimal place.
5. Press
Í
to zoom in. Move the cursor over the intersection. As
you move the cursor, notice that now the
X
and
Y
values have two
decimal places.
6. Press
Í
to zoom in again. Move the free-moving cursor onto a
point exactly on the intersection. Notice the number of decimal
places.
7. Press
y
/
5
to select
5:intersect
. Press
Í
to select the first
curve and
Í
to select the second curve. To guess, move the
trace cursor near the intersection. Press
Í
. What are the
coordinates of the intersection point?
8. Press
q
4
to select
4:ZDecimal
to redisplay the original graph.
9. Press
q
. Select
2:Zoom In
and repeat steps 4 through 8 to explore
the apparent function intersection on the left side of the display.