Identify the domain and range of the following relations.

{(2,5),(4,21),(-8,-8),(-15,5)}

{(7,5),(3,21),(-1,6),(5,7)}

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

{(2,5),(2,2),(4,8),(5,5)}

{(5,9),(8,2),(7,8),(1,3)}