Question

Which one of the following relations represents a function?
a) y^2 = x^2
b) x = 7
c) x = y^2 + 2
d) {(2,1), (3,4), (5,1)}
e) {(1,3), (2,7), (1,-5)}

Answer 1

i wanna say a

put it could turn out to be an x shaped graph so it wouldnt.

Answer 2

i'd go with d

Answer 3

cuzz the they are in x,y pairs and an x only occurs once.

Answer 4

alright thanks!

Answer 5

D