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13
Basic Keyboard/ALGEBRA USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
1. To solve 3(4 – 2x) ≥ 5 – x, rewrite it as 3(4 – 2x) – 5 + x ≥ 0 and determine the
values of x where the function y = 3(4 – 2x) – 5 + x is on or above the x-axis.
2. To do this, press Y= CL and enter 3(4 – 2x) – 5 + X in the Y1 location.
3. Set the viewing window of the graph by pressing ZOOM A (ZOOM)
5 (Default). You should be able to clearly view the x-intercept.
4. Locate the x-intercept at the point (1.4, 0) by pressing 2ndF CALC and
5 (X_Incpt).
5. Since the graph is above the x-axis, to the left of the x-intercept, the solution
to the inequality 3(4 – 2x) – 5 + x ≥ 0 is all values of x such that x ≤ 1.4.
INEQUALITIES
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