This relation is presented as a graph. To see if a relation is or not a function graphically, we can check wether there are a vertical line that passes through the graph more than once. If there is, it is not a function, because this means that the same x value ends up in more than one y value.
In this case, we can see that this happens in every part of x greater than -1:
Thus, the relation in 1 is not a function.