SITE-A teams: Lesson 16

 

Use the CASIO fx7400G to draw the feasibility region of the system of inequalities given below and find the integer values of the vertices:

y < 4

y < -2 x + 12

y > -2/3 x + 4

Turn on the CASIO fx7400G.

Ac_on.gif (1767 bytes)

Use your cursor arrows to highlight the GRAPH menu and press exe.gif (1747 bytes)or just press 4.gif (1703 bytes) when at the main menu screen.

 

Press flag.gif (1724 bytes) (the more key).

Press flag.gif (1724 bytes) (the more key).

Press f4.gif (1732 bytes) ( Y < ).

In the Y1 slot enter the expression 4 and press exe.gif (1747 bytes)

In the Y2 slot enter the expression -2 X + 12 and press exe.gif (1747 bytes)

Press flag.gif (1724 bytes) (the more key).

Press flag.gif (1724 bytes) (the more key).

Press f3.gif (1726 bytes) ( Y > ).

In the Y3 slot enter the expression -2/3 X + 4 and press exe.gif (1747 bytes)

(Make sure no other Y-slot is highlighted, i.e. selected for graphing.)

Press shiftf3.gif (1888 bytes) (V-Window)

Set up the viewing window as follows:

Xmin: 0 Ymin: -4.6

max: 7.8 max: 4.6

s c l: 1 s c l: 1

Press quit.gif (1764 bytes)

Press f4.gif (1732 bytes) (DRAW)

The graph of the inequality appears on the screen of the calculator.

Press shiftf4.gif (1885 bytes) (Sketch)

Press f3.gif (1726 bytes) (Plot)

Use your cursor arrows to move the "cross hairs" to the vertices of the shaded image on the calculator’s screen and note the x and y values displayed at the bottom of the screen.

                                                My answers are: (6, 0), (4, 4), and (0, 4).

Press quit.gif (1764 bytes)

Highlight each inequality and de-select it by pressing f1.gif (1719 bytes) or delete it by pressing f2.gif (1726 bytes)

Press menu.gif (1772 bytes)

Turn off the CASIO fx7400G.

shiftac.gif (1924 bytes) (OFF)