Casio FX-9750GII - Manual (Page 138)

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• 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.