Sketching Contour Curves - Texas Instruments TI-84 Plus Manual

TI-83, TI-83 Plus, TI-84 Plus Guide
Return to the home screen with
the solver by pressing
stored in the solver, you will see the screen displayed on the
right.
If you do not see the screen titled EQUATION SOLVER, press
▲ . If the second line does not read eqn:0 = Y1,
delete the old equation and change so that your screen appears
as shown to the right.
Press
ENTER to get the screen shown to the right.
Input the values P = 5300 and t = 10 with the keystrokes
STO ALPHA 8 (P) ALPHA .
ENTER . This action stores the values P = 5300 and T = 10 in the
calculator.
Return to the home screen with
Y1 and press ENTER .
To evaluate the function A(P, t) = P 1
solver and change the stored values. Then go to the home screen and evaluate Y1 again.
CAUTION: It is very important to note at this point that while we have previously used
the input variable when entering functions in the
evaluate functions with more than one input variable. However, realize that we should not
graph nor use the
Y1
you will see that the calculator considers this
graph is a horizontal line at about 10467.1 and that all values in the table are about 10467.1.)

9.1.1 SKETCHING CONTOUR CURVES

variables, you can draw contour graphs using the three-step process described below. We illus--
trate with a function that gives body heat loss due to the wind. This function, H, appears in
Example 2 of Section 9.1 of Calculus Concepts:
per square meter of body surface area per hour for wind speed v in meters per second.
Step 1: Set H ( v, t ) = 2000. Because we will use the
various values of v , write the function as H ( v, t ) – 2000 = 0.
Copyright © Houghton Mifflin Company. All rights reserved.
2ND MODE (QUIT).
. If there are no equations
MATH 0
( : ) 10 STO
2ND MODE (QUIT). Type
e j
0 06
+
.
4
If you attempt to graph the current
TABLE.
When given a multivariable function with two input
H(v, t) = (10.45 + 10 v – v )(33 – t ) kilogram-calories
Access
press to
CLEAR
5300
ALPHA 4 (T)
4
t
dollars at other values of P and t , return to the
list, we do not follow this rule when we
Y=
Y1 = A(P, t)
a constant. (Check it out and see that the
Y1
to find the value of t at
SOLVER
as
X
or use the table,
97