Answer:
the function is NOT one-to-one
Explanation:
Use the horizontal line test on the graph of the function by imposing a horizontal line onto the graph. If the horizontal line crosses the graph only once, the graph is one-to-one and if it crosses more than once, it is not.
when graphing the function, a horizontal line would touch graphs on the line twice at the same time, making it NOT one-to-one.