Question

if y varies inversely as x, and y=4 as x=8 find y for the x-value of 2.

Answer 1

answers:
16
10
8
14

Answer 2

Do you remember what the formula for an inverse relation is?

Answer 3

no, i just havent done any of these yet

Answer 4

Remember if y varies inversely with x, y=k/x.
If y varies directly with x, y=kx.

Answer 5

Ingrain those into your head!
Now that you have the formula, plug in x and y to find what k is.

Answer 6

im not sure how to plug this one in..

Answer 7

You have y=4 and x=8 correct?
You also have y=k/x. We want to know what k is.
4=k/8. k=32. k is a CONSTANT, meaning it doesn't change. Think of it as the opposite to Kim Kardashian's marriages, it lasts forever. Now that we have k=32, the question asks us to figure out what y is when x=2. What do you think y is?

Answer 8

16?

Answer 9

am i right?

Answer 10

if y=4 and x=8 plug this into y=kx, find the k, and then solve for
y=kx when x is 2

Answer 11

4=32/8?

Answer 12

did i plug that in correct?

Answer 13

y=4 and x=8 plug this into y=kx so 4=k8 therefore k is 1/2

now find the y when x is 2.

Answer 14

idk. i got the answer as 16

Answer 15

for y?

Answer 16

y=1/2x or

so 1/2(2) =?

Answer 17

@meg_72, do you see why it's not 16?

Answer 18

the answer i get from that is not listed on my paper

Answer 19

you got 1, right?

of your answer is not on the list, then either the question is typed the wrong way, or I am just CRAZY, I think the first....

Answer 20

lol the answers they gave me are
16
10
8
14

Answer 21

But this is impossible, I am betting any money, on the table, it is 1!

Answer 22

look,
4=k8 so k=1/2
2(1/2) is what?

Answer 23

Do you understand why I keep getting 1?

Answer 24

haha yea ima bout to find out the answer

Answer 25

$ ∞ it is 1

Answer 26

it says 16 lol

Answer 27

@wio, @dan815

Answer 28

@meg_72, do you believe that is right?

Answer 29

For real?!

Answer 30

so im guessing 4=k/8 k=32 32/8 gives 4 so 4=4 then gives us 16 lol idk

Answer 31

k=32? How in the world do you get that?

Answer 32

OH, k/8 not k8, my bad!

Answer 33

you are right, I suck!!!!!!!!!!!!!!