Question

f(x) = 2/9 - 9/2

x=9

Answer 1

I think I have the answer, but I'm not sure that it's right.

Answer 2

it doesn't depend on x. for every x value, answer is 2/9 - 9/2

what is your answer?

Answer 3

I forgot to put the x after the 2/9

Answer 4

So f(x) = 2/9x - 9/2.

Answer 5

so you should put 9 instead of x. 2/9*9-9/2=2-9/2

can you continue?

Answer 6

What I did was this:

f(x) = 2/9x - 9/2

2/9 times 9/1 and got 18/9.

I subtracted 9/2 from 18/9 and got 9/7. Is that right? I'm supposed to make it an ordered pair.

I put (9, 9/7). Is that right?

Answer 7

nope. 2/9*9/1=18/9=2*9/1*9

9's are canceled. and it's 2/1=2

if you want to subtract, you must make denominators equal.

2/1=2*2/1*2=4/2

4/2-9/2=4-9/2=-5/2

do you understand?

Answer 8

Yes. Thank you. So the ordered pair would be (9,2)?

Answer 9

nope. (9, -5/2) which i find out (:

Answer 10

How did you get the -5?

Answer 11

4/2-9/2 means that you should substract the numerator values and you should write the same denominator.

4-9/2=-5/2

ok?

Answer 12

\[f(x) = \frac{2}{9}x - \frac{9}{2}\]
\[f(9) = \frac{2}{9}(9) - \frac{9}{2}=2 - \frac{9}{2}=\frac{4}{2} - \frac{9}{2}\rightarrow -\frac{5}{2}\]

Answer 13

Can you maybe explain a little more. I'm still not understanding.

Answer 14

You have your initial equation
\[f(x) = \frac{2}{9}x - \frac{9}{2}\]
You are given
x = 9
You plug that in for x in your equation.
\[f(9) = \frac{2}{9}(9) - \frac{9}{2}\]
In the first part, the two nines cancel and you are left with '2'

So now you have
\[= 2 - \frac{9}{2}\]
To be able to do the subtraction you need to get a common denominator of 2
\[2 = \frac{4}{2}\]
So we have,
\[=\frac{4}{2} - \frac{9}{2}\]
To subtract you just take
\[=\frac{4-9}{2}=\frac{-5}{2}\]

Answer 15

Thank you. I understand now.

Answer 16

No problem!

Answer 17

Well, there is one thing that I still don't understand. How did you get 4?

Answer 18

When you are adding or subtracting fractions, you need a common denominator.
We have
\[2 - \frac{9}{2}\]
We need to have something over 2 on the left side. So you do this.
\[\frac{2}{1}\times(\frac{2}{2})=\frac{2\times 2}{2}=\frac{4}{2}\]

Answer 19

Okay. Thank you. I didn't understand where the 4 came from. But now I do.

Answer 20

No problem! Do you have any more questions or concerns?

Answer 21

No thank you. I am finished with my homework. I just wasn't sure that the answer was.

Answer 22

Well, if you ever have any problems that you need help with, feel free to tag me in a question.
(@AshleyNicoleBanks )

Answer 23

( @AshleyNicoleBanks )

Answer 24

There we go, now it decides to work.

Answer 25

I'll be sure to. Thanks.