Texas Instruments TI-84 Plus Manual page 114

Enter P ( w , s ) in Y1. Solve the constraint ( , ) 1
− = + − in Y2.
enter ( , ) 1
g w s w s
Access the EQUATION SOLVER with MATH 0 . Enter the
eqn: 0 = Y2. Press enter to see the screen at right. Choose a
value of that is less than 0.492, say 0.48. Store 0.48 in
w
to the S= line and press ALPHA ENTER (SOLVE) . The
calculator finds the value of s on the constraint is
Go to the home screen. If you like, you can check to see that the
calculator has stored the appropriate values for w and s. Use Y1
to evaluate P(0.48, 0.52). At this close point, the value of P is
more than the value of P at the critical point ( 63.527
Go back to the equation solver and choose a value of
more than 0.492, say 0.51. Put your cursor on the S line and
solve for s. The calculator finds the value of s on the constraint
s =
to be 0.49 .
Go to the home screen and evaluate
use the value of P at the close points is more than its value at the critical point, w ≈ 0.492 whey
protein, s ≈ 0.508 skim milk powder, and P ≈ 10.277% cooking loss is a minimum point.
114
g w s = for 0 and
1
≈
(0.51, 0.49) 63.529.
P
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Go
W.
s =
0.52 .
).
that is
W
≈
Chapter 10
Beca