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18
Advanced Keyboard/ALGEBRA USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
1. To solve the inequality |3.5x + 4| ≥ 10, press Y= CL to clear the Y1
prompt. Press ENTER CL to clear additional prompts.
2. Enter the function |3.5x + 4| in Y1 by pressing MATH B (NUM)
1 (abs) 3 • 5 X/θ/T/n + 4 ENTER . Enter 10 in Y2 by pressing
1 0 .
3. Access the Set Shade screen by pressing 2ndF DRAW G (SHADE) 1
(SET). Since Y2 is the function "on the bottom," press 2ndF VARS A
ENTER 2 (Y2) and since Y1 is the function "on the top," press 2ndF
VARS ENTER 1 (Y1).
4. Set the viewing window by pressing ZOOM A (Zoom) 5 (Default). Press
ZOOM 4 (out) to see the intersection.
5. Press 2ndF CALC 2 (Intsct) to locate a point of intersection. Repeat to
find the other. The intersections are (
-
4, 10) and (1.714, 10). The solution of
the inequality |3.5x + 4| > 10 is all values of x such that x ≤
-
4 or x ≥ 1.714.
6. Turn off the shading by pressing 2ndF DRAW G (SHADE) 2 (INITIAL).
ABSOLUTE VALUE INEQUALITIES
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