Question

Which of the following relations is a function?

A. { (2,6) , (3,9) , (4,2) , (3,6) }
B. { (2,8) , (3,6) , (2,4) , (0,2) }
C. { (3,-2) , (4,7) , (-2,5) , (-4,5) }
D. { (4,7) , (-2,5) , (1,3) , (-2,1) }

Answer 1

It's not A, because there's two y values for the same x value: (3,9) and (3,6)
It's not B, because there's two y values for the same x value: (2,8) and (2,4)

Out of C and D, which one do you think it would be? :)

Answer 2

c?

Answer 3

Yes, it would be C. There's no x value with a different y value
It can't be D, because there's an x value with two different y values. (-2,5) and (-2,1)

Answer 4

thanks :D