Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

if y varies directly as x, and y=7 when x=3, find y when x=7

Option a is correct

Step-by-step explanation:

Given that y varies directly as x

Hence y can be written as kx

y=kx where k is the constant of proportionality

To find k:

Use the fact that y=7 when x=3

We get

7 =3k

OR k =

Hence the relation between x and y is

To find y value when x=7:

From the relation we found we substitute x =7 to find y

Option a is correct