What would be one similarity between "no solution" and "infinitely many solutions (all real numbers)" I know we are talking about inequalitys, but I don't know the similarity.

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.

Absolute value graph shifted point 5 up