Question

If y is directly proportional to x and y = 3 when x = 18, what is the value of x when y = 20?

Answer 1

What do you think "directly proportional" means?

Answer 2

I cannot answer this myself, but this might help:
http://www.mathsisfun.com/algebra/directly-inversely-proportional.html

Answer 3

^ That is a good link. I would suggest reading that @mikehowk57

Answer 4

isnt that y=kx?

Answer 5

Hello, kitti.

Answer 6

i know how to plug it in it just confuses me a bit..

Answer 7

Hello brainz. How are you ?

Answer 8

would it be.. .16 = k? could you check

Answer 9

@mikehowk57 Directly proportional means as one goes up, so does the other. Inversely would mean as one goes up the other goes DOWN.

Answer 10

3 = 18k is the thing

Answer 11

Yup. So what is k?

Answer 12

.16? or .17

Answer 13

Since \(3\lt18\) it is most likely a decimal.
.17 if you round, yes

Answer 14

oh ok thank you

Answer 15

No problem. :)

Answer 16

then what? do you divide the .17 with the 20? or what?

Answer 17

You have k=0.17 in the formula y=kx, right?

Answer 18

Now they give you y=20, so they want the x.

Answer 19

\[y=kx\]\[y=0.17x\]\[20=0.17x\]\[x=?\]

Answer 20

Sorry I didn't answer sooner :P I am fine and taking better care to check definitions LOL How are you?

Answer 21

Chemistry is kicking my butt, but I am fine too haha

Answer 22

@mikehowk57 you good?

Answer 23

Chemistry is fun! :D Ask me anything but math..

Answer 24

Lol. I do need help in Chemistry, I suppose that would work!

Answer 25

Or maybe I keep miscalculating my work. Ew.

Answer 26

Not fun D:

Answer 27

Yeah. :(

Answer 28

@mikehowk57 How are you doing -- do you need help? Are you stuck?

Answer 29

I think he might be trying to solve his own problem.

Answer 30

I got it lol sorry!

Answer 31

Good for you!

Answer 32

y = 3 so x=18 so x= 6*3

y = 20 => x = 6*20 = 120

i think this is the right way to solve this exercise

Answer 33

hope helped

Answer 34

kitty your opinion about this above wrote please ?

Answer 35

ty

Answer 36

The projected profit (in thousands of dollars) of a footwear manufacturing company is modeled by the function f(x) = x2 – 2x – 8 where x is the number of pairs of shoes produced (in thousands). What is the minimum number of shoes that the company needs to produce to avoid a loss?

Answer 37

@jhonyy9 I think I already said several times, plus it's in my bio, that I do not like being called kitty. ☻

Answer 38

ohh really sorry but than how ? please << kitti >> will be right ,accepted ?

Answer 39

yes @jhonyy9 that is OK

Answer 40

ok. kitti nice to meet you and welcome form Europe

Answer 41

so where is now in the night 2,10 oclock

Answer 42

from Europe

sorry so this mean that i m tired i will go sleeping now

good luck

bye bye