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

Tell us....:) just like last time...which is it?

Answer 2

Just remember you cannot see (x,y) the (x) twice in the given points

Answer 3

idk their all different and see u r to a stalker :p

Answer 4

If you see an x-coordinate used more than once, then it's not a function.

Answer 5

i agree with john

Answer 6

like for example

A. (-2,-4/5),(-1,1),(0,0),(-1,1)
^ ^ so no :P

Answer 7

umm b??

Answer 8

lets look at

C.(-2,1),(-1,0),(0,1),(-2,2)

do you see an 'x' more than once?

Answer 9

number 1

Answer 10

Ohhhh I see.....what you're looking at is

in (x,y)

you are looking at the 'y' values ....no you look at the 'x' values....x cannot have more than 1 'y'

so in that same C

C.(-2,1),(-1,0),(0,1),(-2,2)

notice that -2 appears twice in the 'x' part of (x,y)

Answer 11

Because of this....it cannot be a function...get it?

Answer 12

yes soo my answer is b :)

Answer 13

B (-2,0),(0,1/2),(0,3/4),(1,1)
^ ^ so no cuzz of the 2 0s in the x position of the x,y coordinate

Answer 14

Look at B

B.(-2,0),(0,1/2),(0,3/4),(1,1)

the (0) appears twice in the 'x' part of (x , y) right? so not right

Answer 15

Can you list just the x-values for each choice?
Here's the first one:
A. -2, -1, 0, -1
Can you do the same for B., C., and D.?

Answer 16

i belive the answer is d

Answer 17

You believe correctly.

Answer 18

Okay...that is correct,...but do you see why?

Answer 19

no becuz d has both a 1 in the x spot

Answer 20

notice one is a 1...and the other is a -1

Answer 21

D.(-2,4),(-1,1,(0,0),(1,1)

The 'x' values are

-2 , -1 , 0 , 1

Are any of these numbers the same? No..so it is correct

Answer 22

x values for each choice:
A. -2, -1, 0, -1 ----> -1 appears twice. Not a function.
B. -2, 0, 0, 1 ----> 0 appears twice. Not a function.
C. -2, -1, 0, -2 ----> -2 appears twice. Not a function.
D. -2, -1, 0, 1 ----> No number appears twice. This is the function.

Answer 23

OOOOOOOOO so the negitive seperates them

Answer 24

Mmhmm...remember that 1...and negative 1 are two TOTALLY different numbers

Answer 25

ahhhhh i c :p thanks my stalker

Answer 26

lol ugh never going to stop that are you...you're welcome :)