Casio FX-9750GII - Manual (Page 137)

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(Y-ICPT) ... y -intercept
(ISCT) ... Intersection of two graphs
(E)(Y-CAL) ... y -coordinate for given x -coordinate
(E)(X-CAL) ... x -coordinate for given y -coordinate
(E)(° dx ) ... Integral value for a given range
4. When there are multiple graphs on the screen, the selection cursor ( I) is located at the
lowest numbered graph. Press D and A to move the cursor to the graph you want to
select.
5. Press U to select the graph where the cursor is located and display the value produced by
the analysis.
When an analysis produces multiple values, press C to calculate the next value.
Pressing B returns to the previous value.
• Either of the following can cause poor accuracy or even make it impossible to obtain
solutions.
- When the graph of the solution obtained is a point of tangency with the x -axis
- When a solution is an inflection point
I Calculating the Point of Intersection of Two Graphs
Use the following procedure to calculate the point of intersection of two graphs.
1. Draw the graphs.
2. Press
( I) appears at the lowest numbered graph.
3. Press D and A to move the cursor to the graph you want to select.
4. Press U to select the first graph, which changes the shape of the cursor from I to R .
5. Press D and A to move the cursor to the second graph.
6. Press U to calculate the point of intersection for the two graphs.
When an analysis produces multiple values, press C to calculate the next value.
Pressing B returns to the previous value.
Example Graph the two functions shown below, and determine the point of
intersection between Y1 and Y2.
Y1 = x + 1, Y2 = x 2