Answer:
bet
Step-by-step explanation:
Commutative property of addition
<span>This characteristic of non-functions was noticed by I-don't-know-who, and was codified in "The Vertical Line Test": Given the graph of a relation, if you can draw a vertical line that crosses the graph in more than one place, then the relation is not a function.</span>
Infinite amount of solutions
See attached image
Comment for more help or if the image is too hard to see
Hope this helps :)