Question

If y varies directly as x,and y-15 as x=-3 find y for the x - value of 4

Answer 1

try similarly !

Answer 2

y=kx ( y varies directly as x )

Answer 3

when y=15 and x=-3
find k

Answer 4

is y +15 or -15 ? @pjpkap

Answer 5

-15

Answer 6

ok

Answer 7

when y=-15 and x=-3
find k

Answer 8

@pjpkap

Answer 9

I have a question....if it varies directly, can it be solved with proportions ?

Answer 10

y=kx
-15=k*-3

Answer 11

now can u find k @pjpkap

Answer 12

how @texaschic101

Answer 13

can u show ur steps @texaschic101 ?

Answer 14

I just dont get it very well?

Answer 15

-15/-3 = 4/x
can it be solved that way ??

Answer 16

y=kx
-15=k*-3
now can u find k @pjpkap

Answer 17

no

Answer 18

-15=k*-3

Answer 19

-15/-3 = y/4 @texaschic101

Answer 20

yes...thats it...I wrote it wrong

Answer 21

can you solve it that way ?

Answer 22

yes u can ! @texaschic101

Answer 23

if it is indirectly would you use indirect proportion ?

Answer 24

but sometimes variation problems involves a lot of variables ,then ur method won't work.

Answer 25

-15=k*-3 @pjpkap

Answer 26

oh..I see...I have trouble with these, so I was just asking. Thanks for explaining :)

Answer 27

divide both sides by -3 .@pjpkap

Answer 28

Is the following a fair restatement of the problem?

y varies directly as x. When y = 15, then x = -3.
Find y when x = 4.

Answer 29

I thought y was -15

Answer 30

yes y=-15 only as told by @pjpkap

Answer 31

It is -15

Answer 32

-15=k*-3 @pjpkap
divide both sides by -3 .@pjpkap

Answer 33

(-15/-3)=(k*-3)/(-3)

Answer 34

@pjpkap

Answer 35

now can u tell me the value of k ?

Answer 36

Im here just confused

Answer 37

-15=k*-3 @pjpkap
divide both sides by -3 .@pjpkap

Answer 38

can you solve it if it is written like this : -15 = -3k ...pjpkap ?

Answer 39

k=-15/3 k=-5 ??

Answer 40

-15/-3 = what

Answer 41

k=-15/-3 ; k=5

Answer 42

isn't it @pjpkap ?

Answer 43

yes

Answer 44

ok

Answer 45

y=kx
k=5
x=4

Answer 46

now can u find y by substituting in y=kx

Answer 47

@pjpkap

Answer 48

nice explaining CGGURUMANJUNATH :)

Answer 49

:)

Answer 50

thank u . and u too. @texaschic101

Answer 51

y=kx
k=5
x=4
now can u find y by substituting in y=kx @pjpkap

Answer 52

Im trying ,I have dyslexia and all my numbers are getting jumbled.

Answer 53

y=kx
k=5
x=4
y=kx
y=5*4

Answer 54

how much is 5 times 4 @pjpkap

Answer 55

20

Answer 56

u got it .

Answer 57

:)

Answer 58

y=20

Answer 59

that is your required value.

Answer 60

thank you very much, i wish my teacher had as much patience with me.

Answer 61

y=20 is the final answer .

Answer 62

:)