Question

Which of the sets of ordered pairs below represents a function? {(1,2), (2,3), (-2,4), (1,5)} {(5,2), (4,3), (-2,4), (1,5)} {(5,2), (2,3), (-2,4), (2,5)} none of the above

Answer 1

Notice, the set is just an x,y pair
the set without an X-REPEAT is a function

lets's see the first set for example $\bf \{(\boxed{1},2), (2,3), (-2,4), (\boxed{1},5)\} \impliedby \textit{ooops, one }\boxed{repea t}}}$
thus is not a function

check the others