Question

Suppose that y is directly proportional to x and that y=-61 when x=6. Use y=kx to find y when x=6

Answer 1

y directly proportional to x means :

\[y = kx\]

Where k = Proportionality constant..

Answer 2

Now, you have x = 6 and y = -61, so put above and find k from there..

Answer 3

do I multiply -61*6

Answer 4

You have :

\[y = kx\]

Divide by x both the sides to find k here..

Answer 5

I can divide but how do I do both sides

Answer 6

You have to find k..

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

Now cancel whatever you can cancel..

Answer 7

not sure

Answer 8

On right hand side, can't you cancel x with x??

If yes, then please cancel it..

Answer 9

I know how to do it but not on the computer on this site

Answer 10

But you are left with y/x=k

Answer 11

Then take a notebook and keep doing on that..

Yes you have k = y/x this is right..

Now find k, you have x = 6 and y = -61

Answer 12

what do I do with x=6 and y=-61

Answer 13

do I multiply

Answer 14

k = y/x this means y divided by x I guess..

Answer 15

so is that the end of it

Answer 16

10.166

Answer 17

hello

Answer 18

Did you forget - sign with it??

Answer 19

yes so it -10.166

Answer 20

So : \(k = -10.166\)

Now, remember this value of k, you will be using this to find y..

Now : \(y = kx\)

You have x = 6, here so you will here find y..

Answer 21

do I divide -10.166 into 6

Answer 22

No, y = kx means y equals k value multiplied by x..

Answer 23

Actually, question is I think something for Multiple Choice Question..

Like of 1 mark..

It is simple to guess like question..

Answer 24

so I multiply -10.166*6

Answer 25

-60.996

Answer 26

Or you can say, -61..

See, here you are given with when x = 6, y = -61

And look that in the end question is asking for same that find y when x = 6..

So, basically you have answer within your question..