Question

Which of the following relations is a function?
A {(-2,4/5),(-1,-1) (0,0) (-1,-1)}
B {(-2,0), (0,1/2), (0,3/4), (1,1)}
C {(-2,1), (-1,0), (0,1), (-2,2)}
D {(-2,4), (-1,1), (0,0), (1,1)}

Answer 1

in which relation x values are repeating ??
that is not function if there there are same x values more than once that is not function

Answer 2

for example first value is x and second y
(3,2)(3,6)(2.4)
this is not function x's repeated

Answer 3

got it ??

Answer 4

no im still really confussed

Answer 5

its okay :)
so you just have to look at x's
(x ,y)just focus on first number which is x
if there is same x values more than once than relation is not a function
in order to be a functon there should beonly one y for each x

Answer 6

did you understand ??