Question

Which of the following relations is a function?

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

Answer 1

D .
Look at the first numbers if they duplicate it is not a function

Answer 2

in a function there is a unique value of y for each value of x

so only the first one can be a function

Answer 3

it is A

Answer 4

thats what i was about to ask bc D has 5

Answer 5

that duplicates

Answer 6

i must be blind :) then it would be A (:

Answer 7

(: it was a simple mistake but your comment helped me out alot! Thanks guys!