Texas Instruments TI-83 PLUS - Manual (Page 571)

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).