Question

what makes something a function or not?

Answer 1

passing verticle line test

Answer 2

Rebecca, did school just start back?

Answer 3

no, i'm retaking my regents and I haven't done it all summer.. trying to refresh my memory before i take it again.

Answer 4

a function is described as; for any given input, there is only one output given back

Answer 5

being a good student, are we?

Answer 6

if the input is "blue eyes"; the output is: too many people to count, so its not a function

Answer 7

haha yes, I'm trying. but
(1) {(1,5), (2,6), (3,6), (4,7)}
(2) {(4,7), (2,1), (−3,6), (3,4)}
(3) {(−1,6), (1,3), (2,5), (1,7)}
(4) {(−1,2), (0,5), (5,0), (2,−1)}
those are the answers

Answer 8

line them up its easier to compare them that way to me

Answer 9

first one is not a function

Answer 10

(1,5),
(2,6),
(3,6),
(4,7)

each x part gives one y part, this is a function

Answer 11

how do you know?

Answer 12

because 2 and 3, that are part of the domain are both pointing to 6

Answer 13

(4,7),
(2,1),
(−3,6),
(3,4)

this is a function as well, since the input is not doubled

Answer 14

I need to know which one isn't a function and I need to know how to do this.. i remember my teacher saying something like if there's 2 of the same number? or something. my teacher sucked this year.

Answer 15

notice this one:

(−1,6),
(1,3),
(2,5),
(1,7)

there are 2 inputs for "1" and it has 2 different outputs:

this is not a function

Answer 16

Oh! yes, that's what it was! thanks :)

Answer 17

1:3 or 1:7 , it gives 2 answers for an input of 1,