Check the picture.
we notice that for every pair (x, y) in Q, there is a point (-y, x) in Q',
this means that the transformation is a 90° counterclockwise rotation around the origin.
The transformation can be also noticed by sight in the figure.
Answer: 90° counterclockwise rotation
X=-2,+1,-1 ;........................,,,,,,,,,,,
The number of bottles in a full box is 12.
<u><em>Explanation</em></u>
Suppose, the number of bottles in a full box is 
So, the number of bottles in <u>three</u> full boxes 
Now, two more boxes are added, both of which have <u>one fewer bottle than the other three</u>. So, the number of bottles in these two boxes 
As there were 9 bottles initially and now there are 67 bottles in the fridge, <em><u>so the equation will be</u></em>....

Thus, the number of bottles in a full box is 12.