Which relation is not a function?

A

Step-by-step explanation: Notice that the input of nineteen outputs to 10 or 11. Remember that a function should have unique or non-repeating y-coordinates for every x-coordinate. Let me know if you need more clarifications.

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im not sure

no because after the troops were pulled many blacks were killed by hangings lynchings and other cruel ways which in a way interrupted the reconstruction of the south and differed from the way abraham lincoln had an idea of reconstruction