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Graphs of Inequalities
An inequality is a mathematical sentence that contains one of the following relations: > (greater than),
< (less than), >= (greater than or equal to), <= (less than or equal to). A graph of inequalities shows the
region of intersection of two or more inequalities. Shading indicates the region of intersection. If there
is no shaded region in an inequality graph, then there is no set of points that satisfies all the
inequalities.
Entering Data
1. Tap in one of the cells in the column labeled
Inequalities.
2. Enter your inequalities. Use “^” for exponents and “*”
for multiplication.
3. Enter the x and the y limits that you want your inequality
evaluated from and to.
4. Tap on the pencil icon to draw the graph of the
inequality.
Note
The equation must contain an inequality sign and only linear inequalities can be evaluated.
You must enter the x limits and the y limits that you want the equation evaluated under. If you do
not enter them, you will get a syntax error when you try to plot the inequalities.
The equations you want evaluated can be comprised of integers, symbolic constants, decimal
numbers, or any functions or operations with numeric results.
When evaluating graphs of inequalities, a dashed line indicates that the boundary does not belong
to the solution set. However, if you set the line thickness to medium or thick, dashed lines cannot
be distinguished from solid lines. A solid line indicates that the line itself does belong to the
solution set.
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