Question 295611
Where is the triangle for your chosen category?
Save a few steps since there are only three y choices
Try 7 for y first
7=x-2
9=x
We just eliminated a and b
Try 2 for 2
2=x-2
4=x
That doesn't work either
-7=x-2
Add 2 
-5=x
That works
So the answer must  d) (-5,-7)
To be sure you should try it in both equations. But we have eliminated three of the four choices.

The other tutor seems confused.
He first says that 3,7 is not a solution then while working on d) he says it is then he says that -5,-7 is the solution.