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.