Question

Which of the following relations represent a function?

A. {(-1,-3),(3,2),(3,7)}
B.{(-1,4),(2,7),(3,7)}
C.{(-3,7),(3,-7),(3,7)}
D. {(-1,4),(-1,7),(3,5)}
100 POINTS

Answer 1

#A

• (-1,3)
• (3,2)
• (3,7)

3 has two images 2,7 hence not a function

#B

• (-1,4)
• (2,7)
• (3,7)

Every domain has unique range hence function

#C

• (-3,7)
• (3,-7)
• (3,7)

3 has two images hence not a function

#4

-1 has two images hence not a function