Laura & mary are doing their homework together. mary thinks the relation {(1, 1), (1, 3), (2, 3), (3, 4)} is a function, but laura doesn’t think it is. who is correct and why?

Laura is correct.

A function is a relation in which every x-value corresponds with no more than one y-value.  In this problem, the x-value 1 has two different answers; this means it is not a function.

Additionally, if you graphed this, it would not pass the vertical line test.

Bis the correct answer