Texas Instruments TI-89 Titanium User Manual page 78

Steps and keystrokes
4. Highlight the equation for x in the history
area.
Press C C C
5. Auto-paste the highlighted expression to
the entry line. Then substitute the value of
y that was calculated from the second
equation.
@ ¸ Í C ¸ ¸
The solution is:
x = L8/11 and y = L20/11
This example is a demonstration of symbolic manipulation. A one-step function is
available for solving systems of equations.
Constants and Measurement Units
Using the equation f = m...a, calculate the force when m = 5 kilograms and a = 20
2
meters/second . What is the force when a = 9.8 meters/second
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