Question

Determine whether y varies directly with x if so find the constant of variation k and write the equation

Answer 1

y varies directly with x.

means, y is directly proportional to x,

we can write it , $y\propto x$

also we can write it , y = kx , where k is proportionality constant.

now, if value of k depends on x and y , but you didn't mention about value of x and y . we can't find it .

therefore equation is y = kx