Question

Which of the following relations is a function?

(0,4), (-3, 2), (8, 1), (-8, 2)

(0,4), (-3, 6), (0, 3), (-8, 2)

(8,1), (-3, 4), (0, 1), (8, 2)

(0,0), (-3, 3), (8, 1), (-3, 5)

Answer 1

A function cannot have the same x value over its domain.

Answer 2

ANY OF THem have duplicate x parts? pinky got excited on that one

Answer 3

i need the answer

Answer 4

needing the answer is one thing; finding the answer is another

Answer 5

it's wrong

Answer 6

having the same x value is allowed as long as it retains the same y value each time :)

Answer 7

no no first one is the answer

Answer 8

first one might not be the answer on the next one tho, so we really need a better way to determine these things :)

Answer 9

the first one is a function. The others are not because if you fix an x-value, you get more than one y value associated with it. In the second, x=0 has 3 and 4 associated with it. In the third, x=8 has 1 and 2 associated with it. In the the fourth, x=-3 has 3 and 5 associated with it. A function is a relation where one x value has a unique y-value associated with it. Note you can have two x-values associated with one y-value, like in f(x) = x^2