Sharp EL9900 manual Change to parametric mode

EL-9900 Graphing Calculator

Step & Key Operation Display Notes

2-1	Change to parametric mode.
		2nd F	SET UP	E
	2
2-2	Rewrite x = y 2 -2 in parametric form.							Let y = T and substitute in x
	Enter X1T = T 2 -2 and Y1T = T.							= y 2 - 2, to obtain x = T 2- 2.
				x2		2
		Y=	X/ /T/n		—		ENTER
		X/ /T/n

2-3View the graph. Consider why only half of the parabola is drawn.

(To understand this, use Trace fea- ture.)

GRAPH ( TRACE )

2-4Set Tmin to -6.

WINDOW (-) 6 ENTER

The graph starts at T =0 and increases. Since the window setting is T ≥ 0, the region T < 0 is not drawn in the graph.

2-5View the complete parabola.

GRAPH

The calculator provides two methods for graphing parabolas, both of which are easy to perform.

12-1