Sharp el-9950 - Page 70

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Chapter 4: Graphing Features
PROCEDURE
1. Press
Y
toentertheGraphEquationwindow.Sixequation
entryareasappear,from“Y1=”to“Y6=”.Sinceweneedonly
twoequationsinthisexercise,let’suse“Y1=”and“Y2=”.
2. By default, the cursor should be placed on the right side of the
“Y1=”equation,nexttotheequalsign.Ifthisisnotso,usethe
cursorkeystobringthecursortothe“Y1=”line,thenpressthe
C
key to clear any entries. The cursor will automatically be
placed to the right of the equal sign.
3. Enter the first equation, “2
+
1.8X”,torepresenttheTomato
Cab’sfaresystem.
2
+
1 . 8
X
Use the
X
keytoenterthe“x”,representingthedistancein
miles.
4. When the equation line is complete, press
E
. The first
equationisnowstored,andthecursorautomaticallyjumpsto
the second line, where the second equation can be entered.
5. Atthesecondline,press
C
to clear any entries,
then enter “3.5
+
1.2X”to
representtheOrangeCab’s
fare system. When done
entering the equation, press
E
. The two equations are now ready to graph.
6. Press
G
to draw the graphs.
Todrawagraph,“=”mustbehighlighted.Ifnot,movethecursor
to“=”ofthetargetedequationandpress
E
to draw a graph,
and press
E
again not to draw a graph.
Graph Basics
 ThegraphexamplesinthisexercisearecalledX-Ygraphs.An
X-Ygraphisquiteusefulforclearlydisplayingtherelationship
between two variables.