Texas Instruments TI-83 - Appendix Section 1; EXAMPLE 9 Evaluating an Algebraic Expression

Now type the expression shown below and press ENTER:
To get the answer in fraction form, press MATH and select
1:Frac and press ENTER to obtain the result shown in Figure
29.
The syntax for the fnInt( command is:
FnInt(function, variable, a, b)
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Appendix Section 1
EXAMPLE 9 Evaluating an Algebraic Expression
Evaluate each expression if x = 3 and y = -1.
(a) x + 3y (d) | -4x + y |
SOLUTION (a) First, we must store the values of x and y in the calculator.
From the HOME screen, type 3 then press the STOç button.
Finally, press the X,T,
θ
,n button and press ENTER to store the
value of 3 in the variable x. Next, type (-) 1, then press the
STOç button. Finally, press the ALPHA button and 2
nd
1 to
access the variable Y (note the Y in green above the 1) and press
ENTER.