Answer:
The relations of the two graphs on the left are not functions; the relations of the two graphs of the right are functions.
A relation is a function if and only if any input in the domain (x-value) has only one output (y-value).
On the upper left graph, x = 2 has three different images, and x = 3 has two different images. Thus this is not a function.
On the lower left graph, x = 2 has two different images, such as x = 1 and x = -1. Thus this is not a function.
The two graphs on the right are functions because none x-value has two different images.
Step-by-step explanation: