If y varies directly as x and y = 14 when x = 7, find x when y is 30.?

Question

If y varies directly as x and y = 14 when x = 7, find x when y is 30.

x = 2
x = 7
x = 15
The answer cannot be determined with the information given.

Answer 1

when x is 7, y is 14.
so that means, y is two times x.
in equation form: y = 2x

if y = 30, to find x, divide it by 2 to find x.

so:
30 = 2x -- divide each by 2
x = 15

Answer 2

y = k x
14 = 7 k
k = 2
y = 2 x
30 = 2 x
x = 15 is answer.

Answer 3

x=15;

Are you an idiot?!!!!!!!!!!!!!!!!!!!!!!!