Question

Is the relation a function? Explain.
{(1,5), (2,6), (3,7), (4,7)} and {(1,3), (1,6), (2,9), (5,12)}

Answer 1

How would I explain it?

Answer 2

actually the first one is a function

Answer 3

check to see if the first numbers in the ordered pairs repeat
if there is no repeat, then it is a function
if there is a repeat, then it is not a function

Answer 4

{(1,3), (1,6), (2,9), (5,12)}
is not a function since the x -value repeats, and it can not repeat.