To find the box answer, you can divide y by x:
[tex] \frac{y}{x} [/tex]
You can check every pair, bit I'm going to show you the first 2 as an example:
[tex] \frac{ - 6}{ - 4} = \frac{3}{2} \\ \\ \frac{ - 3}{ - 2} = \frac{3}{2} [/tex]
So 3/2 is the answer!