Question

PLEASE HELP!!
which set of ordered pairs in the form (x,y) does not represent a function of x?
A{(-1,2),(3,-2),(0,1),(5,2)}
B. {(-1,2),(3,2),(-2,2),(0,2)}
C. {(-1,2),(3,-2),(0,1),(3,5)}
D. {(-1,2),(2,3),(3,-2),(-2,0)}

Answer 1

pick the one where there is a repeat in the first coordinate

Answer 2

if the first coordinates of each ordered pair are all different,then it is a function
if the first coordinates have repeated numbers, then it is not

Answer 3

so is it A

Answer 4

it says "does NOT" represent a function
the first coordinates in A are \(\{-1,3,0,5\}\) and since they are all different is IS a function
so no, not A

Answer 5

is it clear what i mean by "there are repeats in the first coordinate"?

Answer 6

theres a repeat in b right?

Answer 7

list the first coordinates of B

Answer 8

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

Answer 9

i see it is not clear what i mean, that is why i asked
the first coordinates are the first numbers of each ordered pair

Answer 10

you listed 4 ordered pairs
just list the first numbers of each

Answer 11

clear or no?

Answer 12

no im still confused

Answer 13

\[(\color{red}{-1},2), (\color{red}3,2),(\color{red}{-2},2)(\color{red}0,2)\] the first coordinates are in red

Answer 14

okay

Answer 15

do you see any red numbers repeated?

Answer 16

i hope the answer is "no" they are all different, so this one IS a function
find the one where there is a repeat in the first coordinates

Answer 17

um i think it might be D im not sure

Answer 18

i don't see any repeats in D
check C

Answer 19

oh i see now there is a repeat in c