Which equation has a constant of proportionality equal to 9? choose 1

(B).

Step-by-step 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 , where k is constant of proportionality.

(A).

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

(B).

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

(C).

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

(D).

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