Question

Y varies directly as X. If y=18 when x=6, how do you find the formula, then find y when x is 3?

Answer 1

9

Explanation:

Here `y prop x`

`rArr y = kxx x`...........(i) [this the formula]

put y = 18 and x = 6 we get,

`rArr 18 = kxx 6`

`rArr k = 18/6 =3`

When x = 3 and k = 3, then

y = 3. 3 = 9