SITE-A teams: Lesson 17

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

<- 2 x + 20y

>- 10 x + 36y

>-^{2}/_{5}x +^{36}/_{5}

Turn on the **CASIO fx7400G.**

Use your cursor arrows to highlight the GRAPH menu and press or just press when at the main menu screen.

Press (the more key).

Press (the more key).

Press ( Y __<__ ).

In the Y1 slot enter the expression -2 X + 20 and press

Press (the more key).

Press (the more key).

Press ( Y __>__ ).

In the Y2 slot enter the expression -10 X + 36 and press

In the Y3 slot enter the
expression -^{2}/_{5} X + ^{36}/_{5} and press

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

Press (V-Window)

Set up the viewing window as follows:

Xmin: 0 Ymin: 0

max: 19.5 max: 23

s c l: 5 s c l: 5

Press

Press (DRAW)

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

Press (Sketch)

Press (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: (8, 4), (3, 6), and (2, 16).

Press

Highlight each inequality and de-select it by pressing or delete it by pressing

Press

Turn off the **CASIO fx7400G.**

(OFF)