Which table represents a direct variation function?

Direct variation is y=kx where k is a constant
the fiest way to see if it is direct or not, is if x increases, then y increases as well, then we see if y=kx is valid, basically if we have a constant of variation

the first one x increase and y increasesee if same constanty=kx-4.5=-3k1.5=kso
see next one-1 and 3-3=-1(k)-3=-1(1.5)-3=-1.5falsenot it

2nd is increase and y decrease, so not direct variation
3rd is x is same but y increase so nope
4th is x increase and y increase, now test the constant-7.5=-3k2.5=k
-1 and -2.5-2.5=-1k-2.5=-1(2.5)-2.5=-2.5true
answer is last option

The vertex of the quadratic function is (1.5, -.75)