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TI-83 Plus Activities 568
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.
Procedure
1. Press
z
. Select the default mode settings. Press
o
. Turn off all
functions and stat plots. Enter the functions.
2. Press
q
4
to select
4:ZDecimal
. The display shows that two
solutions may exist (points where the two functions appear to
intersect).