Question

If x and y vary directly, and x = 9 when y = 3, what will be the value of x when y = 15?

Answer 1

Please show how you did it

Answer 2

first divide 15(the new number) by 3( the original), and you get 5.
multiply 9(the original) by 5 for the answer. I hope I did a good job explaining.

Answer 3

if x and y vary directly,
then y = kx

from x = 9 and y = 3
we have:

3 = k*9

so
k = 3/9

k=1/3

and we have:
y = (1/3)x

evaluating at y = 15:
15 = (1/3)x
x = 15*3
x = 45

Answer 4

hi :DD

Answer 5

It doesn't get easier than what @Nurali said

Answer 6

yes thank so much

Answer 7

Anytime.