Question

Suppose y varies jointly as x and z. Find y when x=2and z =27, if y = 192 when x=8 and z= 6.

Answer 1

@moha_10 do u kno how to do this?

Answer 2

It is a direct variation:

\[\large y = k \times (xz)\]

where k is any constant..

Now you are given with y = 192 x = 8 and z = 6

can you find k from here..

Answer 3

@janessia atleast you should reply in case you are not getting...

Answer 4

im sorry i was helping my mom gosh!

Answer 5

hold on i maybe can find k let me try

Answer 6

does k=4? @waterineyes

Answer 7

Yes you are right..

Again use the same formula:

Now you have k=4 x = 2 an d z = 27 find y..

Answer 8

216?

Answer 9

Yes this is the value of y..

Well done...

Answer 10

yayy! i have another question like this
If y varies inversely as x and y=2 when x =25 find x when y=40.
@waterineyes

Answer 11

In case of inverse proportion:

k remains in the numerator but x or whatever is given goes to denominator like this:

\[\large \color{green}{y = \frac{k}{x}}\]

First of all find k by putting x = 25 and y = 2..


After that when you got k using the same formula put y = 40 and find x from there..

Answer 12

ohk hold on

Answer 13

ohk i got a big number i got 2000

Answer 14

what is k??

Answer 15

i got 50 for k

Answer 16

Yes now you have y = 40 and k = 50 solve for x..

Answer 17

why are you multiplying them:???

Answer 18

yes when u look for x u multiply right? cuz its being divided?

Answer 19

\[y = \frac{k}{x}\]

\[x = \frac{k}{y}\]

Answer 20

ohhhhh

Answer 21

i got 1.25

Answer 22

Hurry up tell me It is 3:21 in the morning here..

I have to shut my pc down..

Yes it is 5/4 = 1.25..

Answer 23

Good Night janessia..

Well done....

Answer 24

thnk u

Answer 25

sorry

Answer 26

It is okay no need to be sorry..

Welcome dear..

Answer 27

:)