The correct answer among the choices listed above is the second option. The following system of equations is equivalent. This is because when written in the same form, one equation will yield to the same equation as the other.
y = -1/3x +2/3
2x + 6y = 4
6y = 4 - 2x
y = 2/3 - 1/3x
y = -1/3x +2/3