Can some answer these for me please?

Do the following equations represent direct variations? If so, find the constant of variation

1. 3x-4y=9

2. y=1/5y

3. 8x=4y

thanks

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- Feb 8th 2011, 06:29 PMssppsabresDirect variation help
Can some answer these for me please?

Do the following equations represent direct variations? If so, find the constant of variation

1. 3x-4y=9

2. y=1/5y

3. 8x=4y

thanks - Feb 8th 2011, 06:39 PMssppsabres
please .

- Feb 8th 2011, 06:54 PMskeeter
two variables, y and x, are in a direct variation if y and x can be written in the form y = kx , where k is any constant.

- Feb 8th 2011, 06:57 PMtopsquark
Please do not "bump" your thread. See rule #1 here.

-Dan - Feb 8th 2011, 06:57 PMssppsabres
can u answer the question for me tho? Please

- Feb 8th 2011, 07:06 PMtopsquark
Look at the first equation. Solve it for y. Is this in the form y = kx? Use the same method for the other two. Post your solution for #1 (or either of the others) so we can see if you err at some point.

-Dan - Feb 8th 2011, 07:15 PMssppsabres
y=1.5?

- Feb 8th 2011, 07:17 PMskeeter
- Feb 8th 2011, 07:20 PMssppsabres
y=3?

- Feb 8th 2011, 07:27 PMskeeter
- Feb 8th 2011, 07:30 PMssppsabres
No, so therefore it is not a DV and has no constant?

- Feb 8th 2011, 08:33 PMssppsabres
So no its not?

- Feb 9th 2011, 04:32 AMHallsofIvy
Please post complete sentences and show your work.

Question #1 asked "Do the following equations represent direct variations? If so, find the constant of variation

1. 3x-4y=9"

and when asked to post your solution, you posted, in three separate posts,

"y=1.5? "

"y=3? "

"So no its not?"

The first two make no sense because you were not asked to find a value of y. The last makes no sense because it is not a complete sentence- "so no its not"**what**?

Since the questions asks, first whether or not the relation given is a "direct variation", you should start by stating**what**a direct variatio is and then show how the given relation does or does not satisfy that. If it is a direct variation,**then**you should give the constant of variation, which is NOT "y".