Texas Instruments TI-86 - Manual (Page 219)

Chapter 15: Equation Solving
207
15EQSOLV.DOC TI-86, Chap 15, US English Bob Fedorisko Revised: 02/13/01 2:34 PM Printed: 02/13/01 3:04 PM Page 207 of 12 15EQSOLV.DOC TI-86, Chap 15, US English Bob Fedorisko Revised: 02/13/01 2:34 PM Printed: 02/13/01 3:04 PM Page 207 of 12
Graphing the Solution
When you select GRAPH from the solver menu (&), the
solver graph is displayed with the free-moving cursor.
♦
The vertical axis represents the result of the left side
of the equation minus the right side of the equation
(left
N right) at each independent variable value.
♦
The horizontal axis represents the independent
variable for which you solved the equation.
On the graph, solutions exist for the equation where left N rt=0 , which is where the graph
intersects the x-axis. The solver graph:
♦
Uses the current window and format settings (Chapter 5).
♦
Does not graph the solution according to the current graphing mode.
♦
Always graphs a solution as a function graph.
♦
Does not graph selected functions or turned on stat plots along with the solution.
Solver Graph Tools
You can explore the graph of a solution with the free-moving cursor, as you would on any
other graph. When you do, the coordinate values for the variable (the x-axis) and the value
left N rt (the y-axis) are updated.
To activate the trace cursor, select TRACE from the solver menu. Panning, QuickZoom, and
entering a specific value (Chapter 6) are available with the trace cursor on the solver graph.
To return to the solver menu from a trace, press ..
The graph to the right plots
the solution from the example
on page 202. The window
variable values are: xMin=
L 10
yMin= L 50
xMax=50 yMax=50
You can use the free-moving
cursor or trace cursor to
select a guess on the graph.