Casio FX-8700G Manuel du propriétaire télécharger pdf (Page 32)

You can use a graphing calculator to graph relations; however you must do some

algebra before you graph. A graphing calculator will only graph functions, so

quadratic relations that are not functions must first be written as a combination of

functions. For example, the equation of the parabola x  y

cannot be entered

directly into the graphing calculator. We must solve the equation for y. In this

case, you obtain y 





. To graph, you must enter the two functions y 





and y 





1 Graph the parabola whose equation is x  y

 5y  22 in the viewing

window [0, 30] by [10, 10] with scale factors of 1 on both axes.

First, solve the equation for y.

x  y

 5y  22

x  6.25  (y

 5y  6.25)  22 Complete the square.

x  6.25  (y  2.5)

 22 Simplify.

x  15.75  (y  2.5)

Subtract 22 from each side.







 y  2.5 Take the square root of each side.







 2.5  y Subtract 2.5 from each side.

Now enter the two equations y 





 2.5 and

y  –





 2.5 into the graphing calculator. Since both of

these equations are functions, they can be graphed on a graphing

calculator.

Casio fx-7700GE:

gSR(?-

15.75

2.5

⁄:gmS

R(?-

15.75

2.5

TI-81:

Y‹R(|-

15.75

2.5

ém

‹R(|-

15.75

2.5

TI-82/83:

Y‹R([-

15.75

2.5

m ‹ R ( [ -

15.75

2.5

Quadratic Relations

● Casio fx-7700GE ● TI-81 ● TI-82/83

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 87 88

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Casio FX-8700G Manuel du propriétaire Page 32

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