Chapter 17: Activities
310
5. Press
r † †
to move to
Y6
. Then press
|
and
~
to trace the inequality, observing the
value of
Y
.
When you trace, you can see that Y=1 indicates that Y4<Y5 is true and that Y=0 indicates that
Y4<Y5 is false.
6. Press
o
. Turn off
Y4
,
Y5
, and
Y6
. Enter equations to graph only the inequality.
7. Press
r
.
Notice that the values of
Y7
and
Y8
are zero where the inequality is false. You only see the
intervals of the graph where Y4<Y5 because intervals that are false are multiplied by 0
(Y6
†
Y4 and Y6
†
Y5)
Solving a System of Nonlinear Equations
Problem
Using a graph, solve the equation x
3
N
2x=2cos(x). Stated another way, solve the system of two
equations and two unknowns: y = x
3
N
2x and y = 2cos(x). Use
ZOOM
factors to control the decimal
places displayed on the graph and use
y /
5:intersect
to find an approximate solution.
Procedure
1. Press
z
. Select the default mode settings. Press
o
. Turn off all functions and stat plots.
Enter the functions.
