Sharp EL9900 manual 1Enter the equation y = x for Y2

EL-9900 Graphing Calculator

Step & Key Operation Display Notes

3-1Enter the equation y = - x for Y2.

Y= CL (-) X//T/n

3-2View both graphs.

GRAPH

Notice how Y2 decreases (going down from left to right) instead of increasing (going up from left to right). Negative slopes (m<0) make the line decrease or go down from left to right.

4-1Enter the equation y = x + 2 for Y2.

Y=

CL

X//T/n +

2

4-2View both graphs.		Adding 2 will shift the y = x
		graph upwards.
	GRAPH

Making a graph is easy, and quick comparison of several graphs will help students understand the characteristics of linear equations.

3-1