Answer:

11. {(5,4), (4,3), (3,2), (3,1)}

Domain: {5,4,3}

Range: {4,3,2,1}

The domain is the set of all the values of x and the range is the set of all the values of y.

Relation/Function: Relation

Since x=3 produces y=2 and y=1, the relation (5,4), (4,3), (3,2), (3,1) is not a function.

The relation is not a function.

12. {(-2,3), (-1, 3), (2, 1) (1,1)}

Domain: {-2,-1,2,1}

Range: {3,1}

The domain is the set of all the values of x and the range is the set of all the values of y.

Relation/Function: Function

Since there is one value of y for every value of x in (−2,3),(−1,3),(2,1),(1,1), this relation is a function.

The relation is a function.

13. {(-1, 1),(0,0),(1,1),(-2,4),(2,4)}

Domain: {-1,0,1,-2,2}

Range: {1,0,4}

The domain is the set of all the values of x and the range is the set of all the values of y.

Relation/Function: Function

Since there is one value of y for every value of x in(-1, 1),(0,0),(1,1),(-2,4),(2,4),this relation is a function.