Question

determine whether the relation is a function.
{(2, 4), (2, 6), (3, 8), (4, 10)}

Answer 1

for same value of x we are obtaining two values of y
2--->4
and
2--->6
so it's not a function

Answer 2

{(1, 2), (2, 3), (3, 4) (4, 5)}