Question

Which equation has a constant of proportionality equal to 9?
Choose 1 answer:

Answer 1

y=9x

Explanation:

Khan

Answer 2

(B).
`y=9x`

Explanation:

We have been given 4 equations. We are asked to choose an equation which has constant of proportionality equal to 9.

We know that two proportional quantities are in form
`y=kx`, where k is constant of proportionality.

(A).
`y=(81)/(3)x`

`y=27x`

We can see that value of k is 27, therefore, option A is not a correct choice.

(B).
`y=9x`

We can see that value of k is 9, therefore, option B is the correct choice.

(C).
`y=3x`

We can see that value of k is 3, therefore, option C is not a correct choice.

(D).
`y=(1)/(9)x`

We can see that value of k is 1/9, therefore, option D is not a correct choice.