Question

If x and y vary directly, and x = 12 when y = 3, what will be the value of x when y = 9?

36
27
4.5

Answer 1

If x varies inversely as y, then xy is a constant.

Knowing that x=12 when y=3, we multiply these together to find out what that constant value is.
12 times 3 = 36

So, when y=9, x=36/9=4

Answer: 4

Answer 2

4 isn't one of the answer choices

Answer 3

oops Hahaha im sorry, I skipped a step

Answer 4

ok I got it :), what do you think it is?

Answer 5

........ ?

Answer 6

Idk lol

Answer 7

ok well whats 9*4?

Answer 8

36

Answer 9

there ya go! theres your answer :]

Answer 10

is there anything else you need?

Answer 11

Not yet. :)