y is directly proportional to the positive square root of x when x = 9, y= 12 find y when x =1/2​

y = 2

Step-by-step explanation:

Given y is directly proportional to then the equation relating them is

y = k ← k is the constant of variation

To find k use the condition when x = 9, y = 12

12 = k = 3k ( divide both sides by 3 )

4 = k

y = 4 ← equation of variation

When x = , then

y = 4 = 4 × ← rationalise the denominator by multiplying by

y = × = = 2

where are the choices?

b and c

step-by-step explanation: