Question

Which of the following relations is a function?
A. { (-2, 4), (-1, 3), (5, 2), (1, 4) }
B. { (1, 7), (1, 8), (2, 7), (3, 8) }
C. { (2, 4), (4, 6), (4, 8), (6, 4) }
D. { (5, 7), (6, 3), (8, 6), (5, 4) }

Answer 1

Function.....an 'x' can only have 1 unique 'y'...

so say you have

(1,3) and (1,4) this is NOT a function because 1 cannot equal both 3 AND 4!

so which of your choices has unique 'x's and uniques 'y's...?

Answer 2

b??

Answer 3

wait no c !!

Answer 4

Notice how C has

(4,8) and (4,6)

Cannot be a function right?

Answer 5

right soo its b :)

Answer 6

Notice how B has

(1,7) and (1,8)

:P try again :)

Answer 7

look for the the pairs x,y where x doesn't appear twice

Answer 8

OMG ITS D :)

Answer 9

A :(

Answer 10

function is something that describes a location

Answer 11

Lol D has

(5,7) and (5,4)

1 more try? lol

Answer 12

just remember...with (x,y) the 'x' cannot appear twice in the points given

Answer 13

ughhh A .-. i really thought i had it that time

Answer 14

so technically if you
you have a series of points
EXAMPLE
(1,2) (2,3) (5,6) (7,8)
x domain
y range maps the point