Sharp EL-9900 - Manual (Page 25)

4
Basic Keyboard/ALGEBRA USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
1. Enter the equations Y1 = 3X + 1 and Y2 = 3X + 2 by pressing Y= CL 3
x + 1 ENTER CL 3 x + 2 .
2. Press ZOOM A (ZOOM) 5 (Default) to view the graphs.
3. These lines are called parallel since they have an equal slope but different
y-intercepts. These lines will not intersect.
4. Enter the equations Y1 = 3X - 1 and Y2 = -1/3 X + 1 by pressing Y= CL
3 x – 1 ENTER CL ( - ) 1 a/b 3 x + 1 .
5. Press ZOOM A 7 to view the graphs.
6. These line are called perpendicular since they have slopes that are negative
reciprocals of each other (m
1
= -1/m
2
). Notice, these intersecting lines form
four equal angles.
7. Graph two lines with unequal slopes (not negative reciprocals). What do
you see? Are the lines parallel, perpendicular or neither?
PARALLEL AND
PERPENDICULAR LINES
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