Question

I just need to check my answer

Is this a one-to-one graph? Explain your answer

I think it is not a one-to-one graph because it does not pass the horizontal line test

Answer 1

your answer is correct for the reason you state

Explanation:

A one-to-one function must pass the horizontal line test: no horizontal line intersects the graph at more than one place.

Here, the horizontal line y=3 intersects at x=1 and x=2, so the test fails.