Does the equation represent a direct variation? if so, find the content of variations. 2x - 4y=0

Direct variation is of the form

y = mx

2x-4y = 0

2x = 4y

4y = 2x

y = 2/4 x

y = (1/2) x

which is indeed of the form y = mx

Hence, the equation does represent direct variation.

in y = mx,

the constant of variation is m

so in y = (1/2) x

the constant of variation is 1/2