Casio fx-CG20 uTo determine the coordinates for given points, Example, Example, Y1 = x + 1, Y2, intersection between Y1 and Y2, Y1 = x + 1, Y2 = x(x + 2)(x – 2)

Example	Graph the two functions shown below, and determine the point of
	intersection between Y1 and Y2.
	Y1 = x + 1, Y2 = x2

•You can calculate the point of intersection for rectangular coordinate graphs (Y=f(x) type) and inequality graphs (Y > f(x), Y < f(x), Y ≥ f(x) or Y ≤ f(x)) only.

•Either of the following can cause poor accuracy or even make it impossible to obtain solutions.

-When a solution is a point of tangency between two graphs

-When a solution is an inflection point

uTo determine the coordinates for given points

1.Draw the graph.

2.Select the function you want to perform.

!5(G-SOLVE)6(g)1(Y-CAL) ... y-coordinate for given x

6(g)2(X-CAL) ... x-coordinate for given y

3.If there are multiple graphs on the graph screen, one of them will start flashing. Use f and c to move the flashing to the graph you want to select and then press w.

4.Input the given x-coordinate value or y-coordinate value.

Press w to calculate the corresponding y-coordinate value or x-coordinate value.

Example	Graph the two functions shown below and then determine the y-
	coordinate for x = 0.5 and the x-coordinate for y = 2.2 on graph Y2.
	Y1 = x + 1, Y2 = x(x + 2)(x – 2)

•When there are multiple results for the above procedure, press e to calculate the next value. Pressing d returns to the previous value.

•The X-CAL value cannot be obtained for a parametric function graph.

5-56