Transition Algebra 1 I need help on my Credit Recovery stuff at school THANKS!!!

Question

List the set of ordered pairs (x,y)={[1,2),(2,4),(1,3) ,(3,4)} is a relation between x and y. Then the relation -

A-is a function

B-is not a function as y=4 is related to two values of x i.e  x=2 and x=3

C-is not a function  as x=1 is related to two values y i.e. y=2 and y=3

D-is not a function except at the point x=2

Answer 1

Drea, if I am understanding the question correctly, the answer is C.  In order for a list of ordered pairs to be a function, every x must have one and only one y.  Since we have (1,2) and (1,3), this means that the x-value of 1 has two y's, which are 2 and 3.