Texas Instruments TI-82 Manual page 28

A-28
TI-82/TI-83 Graphics Calculators
Predict the tax owed in 1998 and 1999 where the tax is
found using the linear model computed from the data
given in Section 1.4.1 of this Guide:
Tax = 540.37143t + 2538.90476 dollars and t is the
number of years since 1992.
Remember that you should always use the full model,
i.e., the function you pasted in Y
Note that 1998 is six years since 1992, so x = 6.
Predict the value of y in 1999 using the TABLE. Note
that 1999 is seven years since 1992, so x = 7. The 1999
tax is predicted to be approximately $6322.
(You can type over x-values already in the table when
using Indpnt: ASK, or you can press
previously-entered values.)
1.4.11 COPYING GRAPHS TO PAPER
graphics screen to paper. If so, use the following to more accurately perform this task.
TI-82 Press
GRAPH
Press
TRACE
the upper right-hand corner of the screen indicates that
you are tracing the scatter plot of the data. Use either
these trace values or the data lists to mark the data
points on your paper.
Press to move the trace cursor to the linear model
graph. The 1 in the right-hand corner of the screen
tells you which function you are tracing (in this case, Y
Use and/or
as possible and mark those points on your paper. Use a
ruler to connect the model points and draw the line.
TI-83 Press
GRAPH
Press
TRACE
in the upper left-hand corner of the screen indicates that
you are tracing the scatter plot of the data. Use either
these trace values or the data lists to mark the data
points on your paper.
, for all computations.
1
DEL
to return the graph to the screen.
and to trace the graph. The P1 in
to locate values that are as ÒniceÓ
to return the graph to the screen.
and to trace the graph. The P1
to delete
Your instructor may ask you to copy what is on your
.
1 )
L ,L
: 1 2
Copyright © Houghton Mifflin Company. All rights reserved.
The 1998 tax is predicted
to be about $5781.