SOLUTION KEY

1)                    Domain ={1,2,3,4}

         Range = {4, 5}

A                         B

1 4

2

3 5

4

 

2)

    

x

1

2

3

4

5

y

3

6

1

18

27

 

 

                                                                

 

·     Yes

y=x2+2

·     Yes, it is a function because for each value of ‘x’,there exists a unique value of ‘y’

 

3) R={(5,6),(5,1),(4,12),(8,3),(6,3),(2,9)}

No, it is not a function because one element in A has two images in B

 

4) R= {(3, 6), (4, 7), (5, 8), (6, 9)}

Domain :{ 3, 4, 5, 6}

Range :{ 6, 7, 8, 9}

Yes, the relation is function as each element of set A has its unique image in set B.