Eddy
Consider this. There is nothing wrong with looking things up; I do it daily. But searching the internet is not developing your mathematical skills and intuition. I suspect that you are trying to memorize hundreds of templates for very specific problems. When you see a problem that does not fit into a template that you recognize quickly, you default to the internet. That process will not help you one bit when you run into a new problem on a test.
Most of us probably do not, and certainly I do not, usually “see” how to find a solution when confronted with a new type of problem. I have some routines that I have found helpful when confronted with something mathematically new, and the most important of those is to TRY things, not one thing but multiple things. This problem is about a coordinate plane. I would instantly sketch one even though I have no clue what to do with it yet. It is also about a square with a perimeter of 36 units. That means each side has length of 9 units. (You did that, which was good, but then you apparently stopped.) You are told where one corner of that square is located. Mark that point on the sketch of the plane.
Now lev made an interesting point. Are we to find just one possible point for a second corner, or are we to find a formula for finding all of them? Obviously the first problem is considerably easier than the second. But I’d start by trying to draw just one square with length of 9 units from my initial point for both problems. Maybe trying to draw a square with one corner pinned will provide insight.
You are always looking for insight, and the best way to find insight ON YOUR OWN is to try as many things as seem relevant. Frankly, had you tried all three of those fairly obvious efforts rather than just one, I‘d bet a lot that you would have quickly solved this problem on your own.
Now I want to be fair. I have much more mathematical experience than you so I will dream up a lot more things to try than you will. But the point is the same: to solve a problem requires insight, and insight comes from trying DIFFERENT things.