Question

Which of the following lists of ordered pairs is a function?
A.(1,2),(0,3),(1,4),(6,5)
B.(9,4),(5,0),(1,-4),(-2,-6)
C.(4,2),(4,-2),(9,3),(16,4)
D.(9,4),(5,0),(5,3),(-2,-6)

Answer 1

B

Answer 2

try graphing

Answer 3

I say B because the x doesn't repeat

Answer 4

To be a function, each input must have a single output. So looking at A.) for instance, you can see that when you input 1, you get both a 2 and a 4, so obviously that is not a function!