Question

(-3,0.8) (-2,-0.8) (-1,1.6) (0, -1.6) (1,0.4) (2,-0.4) (3,0.8) (4, -0.8)

A) not a function

B)function

Answer 1

Hey Vince!

Here are some points that would make up a function:
\(\large\rm (2,4)\quad (3,4)\quad (4,1)\quad(5,0)\)

Here are some points that would NOT make up a function:
\(\large\rm (2,4)\quad(\color{red}{3},4)\quad(\color{red}{3},1)\quad(5,0)\)

See how the x=3 is repeated?
The second and third coordinate would be stacked, one above the other.
So they fail the vertical line test.
We can't map an x-coordinate to more than one y-coordinate.

Answer 2

Are you points giving you any problems like that?
Try to compare to the example given.

Answer 3

so only if the x repeats its not a function?

Answer 4

if the y repeats it doesnt matter?

Answer 5

Correct.
Even this would be considered a function:
\(\large\rm (3,0)\quad(4,0)\quad(5,0)\quad(6,0)\)

Answer 6

okay thank you

Answer 7

np