3-8-4

Analyzing a Function Used to Draw a Graph

u To obtain the point of intersection for two graphs

Example: To graph the functions y = x + 1 and y = x2, and determine their point of intersection

(1)Display the View Window dialog box, and then configure it with the following parameters.

xmin = –5,

xmax = 5,

xscale = 1

ymin = –5,

ymax = 5,

yscale = 2

(2)On the Graph Editor window, input and store y = x + 1 into line y1 and y = x2 into y2, and then tap $ to graph them.

•Make sure that only y1 and y2 are checked.

(3)Tap [Analysis], [G-Solve], and then [Intersect].

•This causes “Intersect” to appear on the Graph window, with a pointer located at the point of intersection. The x- and y-coordinates at the current pointer location are also shown on the Graph window.

(4)To obtain other points of intersection, press the left or right cursor key, or tap the left or right graph controller arrows.

Result Screenshots

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