2011/91) What is the graph of xy = 3y

(A) one point
(B) two points
(C) one line
(D) two lines
(E) a right angle

this is a tricky question and ans is simple

xy = 3y => y(x-3) = 0 so y = 0 or x = 3

y= 0 is a line and x= 3 is another line and hence ans is D