Question

Which of the following sets is a function?

{(0, 1), (-2, 8), (5, 19), (2, 8)}
{(1, 0), (11, 0), (-5, 7), (1, 9)}
{(17, -8), (1, 16), (53, 9), (1, 23)}

Answer 1

A function will not have any repeating x values. They can have repeating y values, just not the x ones. So u need to find the set of points that has all different x values...and that is ur function.

{(0,1), (-2,8), (5,19), (2,8)}....this has no repeating x values and is therefore, a function