Question

Which relation does not represent a function?

(-8, 4), (-3, 2), (1, 3), (5, -8)

(2, 0), (4, 6), (7, 6), (8, 5)

(-4, 6), (-1, 1), (0, 4), (4, 7)

(1, 2), (2, 5), (5, 7), (1, 3)

Answer 1

Hint: In a function, plugging in one value of x should yield only ONE value of y.

Answer 2

So what you are looking for is an x that is giving more than one value of y.

Answer 3

Can you see it?

Answer 4

no :9

Answer 5

Here is a possible random answer: (1,0), (1,1)
This is not a function because plugging in x=1 gives us 0 and 1. Does that help?

Answer 6

Still there @zahabaha ?

Answer 7

The short and dry version is that you are looking for any set of points that has the same y value

Answer 8

The second set of numbers contains two different x values with the same y value. Meaning they cannot be part of the same function

Answer 9

@MathBlonde I disagree. How about a function such as this:

As you can see, it is possible to have two different values of x giving the same y value.

Answer 10

I believe the answer is the last option. For a function, a single value of x should yield only one value of y.

Answer 11

The last option has (1,2) and (1,3). Do you agree @MathBlonde ?

Answer 12

I do agree. My thinking was backwards :)

Answer 13

Heh. It happens. :)