All coordinates on the coordinate plane take the form (a, b), where a is the x value and b is the y value.
In order for a resulting graph to be a function, the graph must pass the vertical line test, which means that there cannot be more than one y value for one x value.
Thus, there cannot be any additional y values on the following values of x:
-3, -2, 1, and 2
Don't know where these numbers came from? I looked at the graph and listed every taken x value.
If any of the choices has any of the listed numbers as an x value, then it can be eliminated since it cannot be the answer.
After going through the process of elimination, we are left with the first choice, (-1, 2). This is your answer.
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