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Section 11.8 Systems of Linear Inequalities; Linear
Programming
EXAMPLE 2 Graphing a Linear Inequality Using a Graphing Utility
Use a graphing utility to graph 3
SOLUTION
= −
+
Graph
Y
3
x
6
(this is obtained by solving 3x + y - 6 = 0 for y). Use the same
1
viewing window as that used in the text.
Now test the point (-1, 2) by typing the following:
The asterisk is the multiplication symbol.
We now need the inequality. It can be found in the TEST menu (this is a second function
located above the MATH button):
TEST
menu
Once you select the TEST menu you should obtain the following on your screen:
+ − ≤ .
x y
6 0
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