The coordinates of the vertices of triangle, whose sides have the equations y=x-3,2y=x-4andx-4=0 are

The coordinates of the vertices of triangle, whose sides have the equations y=x-3,2y=x-4andx-4=0 are:
(i) (2,-1) , (4,0) & (4,1) (ii) (2,1) , (4,0) & (4,1) (iii) (2,1) , (-4,0) & (-4,1) (iv) none of these