What is the solution of y − 4x = 0 and 3x + 6y = 9?

A.
`x= 0`, `y= (3)/(2)`

B.
`x= (1)/(3)`, `y= (4)/(3)`

C.
`x = 1`, `y = -1`

D.
`x= (1)/(4)`, `y= (2)/(3)`