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Evaluating and Solving
Equations
An Example
and
allow you to do calculations involving variables.
For example, suppose you frequently need to determine the volume of
a straight section of pipe. The equation is:
V= 25nd%1l
where d is the inside diameter of the pipe, and [ is its length. You
could key in the calculation over and over; for example, .25 [x] (=]
[x] 2.5 @(?][x] 16 calculates the volume of 16 inches of 2%2-inch pipe.
However, storing the equation saves keystrokes and lets you use the
calculator to "remember" the relationship between diameter, length,
and volume.
Keys:
Display:
Description:
B(EQUATIONS]
Displays the list of
equations.
If necessary, press [¥] until the HP-22S displays TYPE NEW EGN.
Then:
vE
v=
V types V.
25 [x] B~ [x]
Y=25X%17X
B[] types n.
D (] 2
V=25xaxD"2
(] types .
70
6: Evaluating and Solving Equations
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