Casio FX-9750GII User Manual

Page 138

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5-32

• 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

P

f

(

x

) or Y

O

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

I Determining the Coordinates for Given Points

The following procedure describes how to determine the

y

-coordinate for a given

x

, and the

x

-coordinate for a given

y

.

1. Draw the graph.

2. Select the function you want to perform. When there are multiple graphs, the selection

cursor (

I) appears at the lowest numbered graph.

y

-coordinate for given

x

(E)(X-CAL) ...

x

-coordinate for given

y

3. Use

DA to move the cursor (I) to the graph you want, and then press U to select it.

4. Input the given

x

-coordinate value or

y

-coordinate value.

Press

U 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

C to calculate the next

value. Pressing

B returns to the previous value.

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

I Calculating the lntegral Value for a Given Range

Use the following procedure to obtain integration values for a given range.

1. Draw the graph.

2. Press

dx

). When there are multiple graphs, this causes the

selection cursor (

I) to appear at the lowest numbered graph.

3. Use

DA to move the cursor (I) to the graph you want, and then press U to select it.

4. Use

BC to move the lower limit pointer to the location you want, and then press U.

5. Use

C to move the upper limit pointer to the location you want.

6. Press

U to calculate the integral value.

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