Does the following execution satisfy linearizability? If not, remove one operation so that the execution satisfies linearizability.

I understand that linearizability requires an execution to be valid and perserve per-node and real-time order, but am struggling to apply it to this execution. Particularly confused about what 1 = R(x) means. My intuition is that we must remove 1 = R(x) because 1 has already been overwritten with y, so you would be reading y instead of x at that point. Any help or guidance is appreciated!