let's check each one of the options:
(A) is not equivalent
(B) is not equivalent
(C) is not equivalent
(D) it is equivalent to the given equation because
[tex]-x+3y=-6\text{ }[/tex]we divide in both sides of the equality by 3 and obtain:
[tex]-\frac{1}{3}x+y=-2[/tex]then:
[tex]y=\frac{1}{3}x-2[/tex]