Find the solution to the system by graphing. x+y=0 2x-y=-9

The solution to this equation is (-3,3)

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

2ones makes no sense six flags with magic mountains that’s wrong