I need help badly with this Algebra question, if someone could explain how to solve this It'd really help.

Answer:
The answer is A, or the top left function.
Step-by-step explanation:
Use the vertical line test. If you can draw a straight, vertical line through the graph, and the function intersects it at 2 or more points, it is NOT a function. Using this logic, only A is the answer.
Y33T