State whether or not each equation or situation represents direct variation. Match each function with the point that represents the vertex of its graph. No one point be used more than once.

1. y = ( x - 3)( x - 7)
(1, 4)
2. y = -2( x + 2) 2
(2, 0)
3. y = x 2 - 2 x - 3
(-5, 4)
4. y = ( x - 2) 2
(5, -4)
5. y = -2 x 2 + 4 x + 2
(1, -4)
6. y = -4( x + 5) 2 + 4
(-2, 0)