Question

Variable y varies directly with variable x, and y = 9 when x = 5.

What is the constant of variation in decimal form?

Answer 1

fan

Answer 2

is it 1.8

Answer 3

?

Answer 4

k

Answer 5

she left

Answer 6

you got the right answer tho..just to help you there :3

Answer 7

heres your formula

y=kx

for future reference

Answer 8

welcome @Zubairshareef68

Answer 9

Variable y varies directly with variable x, and y = 5 when x = 8.

What is the value of x when y = 15?

Answer 10

is it 24

Answer 11

this is to make sure

Answer 12

The number of miles Melody rides her bicycle, m, varies directly with the amount of time spent riding the bike, t. When Melody bikes for 1.5 h, she travels 10.5 mi. Which equation shows this direct linear variation?

A.
m = 7t

B.
m = 7.5t

C.
m = 12t

D.
m = 15.75t

Answer 13

A

Answer 14

yes you got that by using this formula
right?
y=kx

Answer 15

ya

Answer 16

is both of um right

Answer 17

correct

Answer 18

I was the first one to work with you on your first post.
We discussed what "direct variation" means.
This problem is quite similar; the only additional step is that you have to find the constant of proportionality, k, in y=kx.

Try to use what you learned in previous problems to solve new ones.

Answer 19

ok

Answer 20

Write down:

Direct proportion: y=kx
Inverse proportion: y = k/x

Answer 21

ok i did

Answer 22

Let's check your answer. You say the answer is A: m=7t.

Substitute "y = 9 when x = 5". when t=7, do you get m=9?

Answer 23

@Electric_Blue Cool

Answer 24

ok i can see that @mathmale has this under control...cheers

Answer 25

ya

Answer 26

@Electric_Blue sorry I cant send you a message so....

Answer 27

me

Answer 28

who u talking to

Answer 29

Electric_Blue that's why there was the @ sign

Answer 30

mathmale here. All I'm saying, Zubairshareef68 , is that you should go back to the original problem: "Variable y varies directly with variable x, and y = 9 when x = 5."

Substitute t (or x) = 5 into the answer equation you've chosen. The result MUST be 9. If it is, your choice was correct. Otherwise, try again.

Over and out. Welcome again to OpenStudy.

Answer 31

cam you ask a question more than one with out closeing the one

Answer 32

thx