Determine whether the relation is a function.
{(4, 9), (-4, 9), (2, 3), (10, -5)}
yes, if no x maps to more than one y.
Since all the x's are unique, it is a function.
{(4, 9), (-4, 9), (2, 3), (10, -5)}
Since all the x's are unique, it is a function.