Parallel And Perpendicular Lines - Sharp EL-9900C User Manual

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