Question

Which does not show a direct variation between x and y?

A.
y = 0.5x

B.
y = 9/x

C.
y = x/9

D.
y = 2x

Answer 1

direct variation means
y = k x
where k is some number.
remember that x/9 can be written as
\[ \frac{1}{9} x \]
which means k= 1/9 so you have direct variation

Answer 2

all the direct variations will be number times x

which choice is not "number times x" ?

Answer 3

which one?

Answer 4

is A number times x ?

Answer 5

idk but is it a b c or d

Answer 6

@phi

Answer 7

do you know which one it is?

Answer 8

are you saying you can't pick out the choices that have a number times x ?

Answer 9

for choice A, is 0.5 a number ? is x an "x" ?

is 0.5 x a number times x ?

Answer 10

what about choice D ? is 2 a number ?
is 2 x a number times x ?

Answer 11

in choice C, is 1/9 a number ?
is 1/9 x a number times x ?

Answer 12

is it choice c?

Answer 13

? @phi

Answer 14

@phi hello is it c?

Answer 15

in choice C, is 1/9 a number ?
is 1/9 x a number times x ?

Answer 16

is 1/9 a number ? YES
1/9 x means 1/9 times x

that is direct variation

Answer 17

so its c? yes or no

Answer 18

First is 1/9 a number ?

Answer 19

yes

Answer 20

direct variation is a number times x

1/9 * x or
1/9 x or
x/9
all mean the same thing.... a number 1/9 times x

so it is direct variation

you want the choice that is not direct variation

Answer 21

ok thanks so its c right yes or no this is like my 3rd or 4th time!

Answer 22

re-read what I posted.

Answer 23

please is it c or not

Answer 24

it is !!!!!!!!!!!!!!!

Answer 25

you have to read more carefully.

I wrote multiple times that choice C IS DIRECT variation
you want the choice that is NOT direct variation

if choice C is DIRECT variation, it cannot be the answer.

Answer 26

..........................

Answer 27

you could find the answer by eliminating all the choices that are direct variation


A y = 0.5 x <-- direct

B.y = 9/x or 9 (1/x)

C.y = x/9 or y= (1/9) x<-- direct

D. y = 2 x<-- direct

Answer 28

its b..............