Question

Help me with this question plzz

Answer 1

Answer:

A.

Step-by-step explanation:

To check if a graph is a function, use the vertical line test.  Use a ruler or straight edge, or simply imagine a vertical line.  Move the line across the graph.  The line should only intersect the graph at one point at any time.

B isn't a function because the line intersects the graph at two places (when x = 0).

C isn't a function because the line intersects the graph at two places (between x = -1 and x = 1).

D isn't a function because the line intersects the graph at two places (when x < -1 and when x > 1).

Only A is a function.