TI-82/83 Graphing Inequalities
[Pages:2]Name
Class
TI-82/83 Graphing Inequalities
Example
Graph the inequality y 2x 7 using the shade function.
STEP 1: To graph an inequality, first enter the
STEP 2: The calculator cannot draw dashed lines. It
equation as an equality. Press Y= and enter y
2x 7 as Y1. Press
to see the screen.
can only draw solid lines. Press the shading command.
[DRAW] 7 for
STEP 3: Shade from the bottom of the screen by
pressing
1 4 to enter Ymin. Shade to Y1 by
pressing
[Y-VARS] 1 1 (TI-83:
1 1). Press
to see the graph.
STEP 4: (TI-82 only) To use a lighter shade, first
erase the old shading by pressing [DRAW] 1.
Then press [QUIT] [ENTRY]
3
.
TI-82: Shade( ( [DRAW] 7) uses three inputs:
minimum function, maximum function, and shading
level. Enter the inputs in order. Separate them by
commas ( ).
From the bottom of the screen: Select Ymin by
pressing
1 4. Enter the inequality and the level
of shading. The level of shading can vary from 1
(darkest) to 8 (lightest).
From the top of the screen: Enter the inequality.
Select Ymax by pressing
1 5. Finally, enter the
level of shading.
TI-83: Graphs can be shaded from the function
screen. Additional shadings will be drawn at one of
four different angles.
From the bottom of the screen: Enter the
inequality on the home screen. Press Y=
to move the cursor to the graph type. Press
3 times.
From the top of the screen: Enter the inequality
on the home screen. Press Y=
and
twice.
EXAMPLES: ? To shade y 2x 3 (as Y1), use Shade(Y1,Ymax,1). ? To shade y 0.8x 1 (as Y1) and y 2x (as Y2), use Shade(Y1, Y2,1).
Exercises
Graph each inequality. Add the correct shading. Note on your own paper
whether the line should be solid or dashed. 1. y 2x 4
2. y
1 2
x2
3
3.
y
1 2
x
3 and
y
x
3
4. y x 4 and y 2x 6
? 2000 ? 2007 Pearson Education, Inc. All Rights Reserved.
Answers
For 1-4. the level of shading may vary. Samples use level 2. 1.
; solid 2.
3. TI-81, TI-82:
; dashed ;
both dashed
4. TI-81, TI-82: ;
top is solid, bottom is dashed
? 2000 ? 2007 Pearson Education, Inc. All Rights Reserved.
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