I saw this in my textbook, and was wondering what it means?
If a function is one-to-one, then the image is the graph of a function. This is because if the function satisfies the horizontal line test, then its reflection will satisfy the vertical line test.
I'm mainly confused about the bolded part.
If anyone could please explain this, I'd really appreciate it!!
Thank you so much!!

    sarah99 Im pretty sure it means like if it passes the horizontal line test which is basically where the function intersects the graph once then it will also only intersect the graph once vertically hence the one-to-one

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