Question

if y=45 when x=270, what is y when x=252?

Answer 1

Is this a direct variation? Again, this is a problem which is not clear in the wording.

Answer 2

It's a direct variation, so use: y=kx
You have 45=270k
Solve for k
Once that's done, plug it back in to get the next y

Answer 3

How do you know this is a direct variation?????????

Answer 4

Why are you assuming that it is a direct variation problem if it doesnt say so. Perhaps this is an inverse variation problem. Who knows? Nobody know unless it says so in the stem.

Answer 5

the problem does not say anything just that what I asked, so im guessing the problem is inaccurate.

Answer 6

what chapter are u learning andrew?

Answer 7

Tell your teacher that you dont know how x and y vary, thus you cannot answer the question.

Answer 8

That's true, but if it wanted you to know it was an inverse variation, it would of let you know.

Answer 9

I've been doing this long enough to know.

Answer 10

Not if this is a problem in the section of Inverse Variations.

Answer 11

there is one heading in bold on this page and says " Find the value of y for a given value of x, if y varies directly with x" Not sure if it goes with that question but doesn't say aswell. should I assume its direct?

Answer 12

Ness..take my word, I've been with this longer than you have, and when a question is ambiguous, the question is to be tossed.

Answer 13

yeah, so ur question is trying to find the direct variation

Answer 14

Told ya ;)

Answer 15

OK, if it says direct variation, then it is direct variation!

Answer 16

ness9630 if the question is direct, where does the k come from? I got k=0.16 but there is no k even in the question nor a problem to plug it into

Answer 17

Ness...that's not a valid argument...told you so..sounds childish to me. If you are an educator, you would know better than that.

Answer 18

how about u guys stop arguing and let's find a way to help @andrewc98

Answer 19

Classic zale

Answer 20

@andrewc98 the form of finding the direct variation is y=kx
and the form of finding the inverse variation is y=k/x

Answer 21

but your question is looking for the direct variation

Answer 22

k is the constant variation

Answer 23

Once you know k, plug it back in to y=kx with the new given value

Answer 24

If y varies directly as x, and y = to something when x = something, then it's asked to find k

Answer 25

okay I did the math and the answer k=0.16 is not correct. 0.16*252 to find y is 40.32 but there is no 40.32 there is a.-1512 b.1512 c-42 d.42

Answer 26

So y=(252)k
Plug your value of k back in.

Answer 27

Your math is wrong

Answer 28

i rearranged the numbers 45*270 and got 1512 which is an answer choice so i guess ill go with that.

Answer 29

So 45/270 simplifies to 1/6 and 1/6*252
252/6=?

Answer 30

Thank you all for helping me, i appreciate it!