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EL-9900 Graphing Calculator
NotesStep & Key Operation Display
4
Move the tracer and find another
intersection.
y = 2x - 5 and y = 7
intersect at (6,7).
5
Solve the inequalities.
The solution to the “double”
inequality -1
≤
2x - 5
≤
7 con-
sists of all values of x in be-
tween, and including, 2 and 6
(i.e., x
≥
2 and x
≤
6). The so-
lution is 2
≤
x
≤
6.
9-2
Graphical solution methods not only offer instructive visualization of the solution
process, but they can be applied to inequalities that are often difficult to solve
algebraically. The EL-9900 allows the solution region to be indicated visually using the
Shade feature. Also, the points of intersection can be obtained easily.
2
2nd F CALC