Datasheet

Quite the Quadrilateral “How-To”
The following will demonstrate how to enter a set of coordinates into two lists using
the Statistics mode of the Casio fx-9750GII. After the list is set up, you will find the
slope of a line containing the points, save the equation in the Graph mode, and find
the intersection of two lines. You will then find the length of a segment.
Line segment AB has endpoints at (−5, -2) and (3, 6) and segment CD has endpoints
at (−6, 4) and (3, −7). Find the slope for each line segment, the coordinates of their
intersection, and the length of
A
B .
To enter values into a list and find the line of best fit:
Activity 7 • Geometry with the Casio fx-9750GII
1. From the Main Menu, highlight the Statistics icon
and press l or press 2.
2. To label the first column, highlight the space below
List 1 and press a+(X)l.
3. To label the second column, highlight the space
below List 2 and press a-(Y)l.
4. Enter the x-values into List 1 and the y-values into
List 2. Be sure to press l after each value.
5. To view the points, press q(GRPH)u(Set)
Nq(GPH1)Nw(XY)Nq(List)1N
q(List)2lq(GPH1).
6. Press
d and q(GPH1) to view the graph.
7. Press q(Calc)w(X)q(ax+b) to find the line
of best fit.
8. Press
y(Copy)l to copy the equation into
the graph function.
9. Repeat the same steps to find the equation for the second segment.