Does anyone know this

A

Step-by-step explanation:

To figure out whether a graph is a function, you need to use the line test.  The line test is where you pass a vertical line over the graph.  If the vertical line crosses the graph more than once, the graph is not a function.  You can use your pencil as a vertical line.

Graph 1 is not a function because the vertical line will cross the graph twice.

Graph 2 is a function because the vertical does not cross the graph twice.

Graph 3 is not a function because the vertical line will cross the graph twice.

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6