Question

Select Is a Function or Is not a Function to correctly classify each relation.
{(2, 2),(4, 4),(6, 6),(8, 8)} is this function or not function
{(0, 3),(3, 5),(5, 6),(8, 4)} is this function or not function
{(1, 2),(3, 3),(4, 8),(6, 3)} is this function or not function
{(3, 4),(5, 2),(5, 6),(7, 3)} is this function or not function
Please help me I will give you the brain thing and extra points.

Answer 1

Answer: all of these but the last one are functions, and the last one is not because there are repetitive (x) factors.