Question

Which relation is a function?

A.
(0, –45), (–45, –13), (18, –45)

B.
(33, –11), (23, 18), (23, –9)

C.
(8, 48), (8, 55), (9, 60)

D.
(–13, 30), (30, 19), (–13, 39)
@precal @dan815 @tanya123 @walking_stick

Answer 1

same concept as before

Answer 2

Do the vertical test

Answer 3

i don't know how to answer this one though

Answer 4

same idea

Answer 5

i tried the vertical test but none of them pass

Answer 6

one does pass, I believe you plotted one incorrectly

Answer 7

i think it might be C again?

Answer 8

nope (8,48) and (8, 55) fails vertical line test

Answer 9

an x value can be repeated so long as it always has the same y value. A function is a relationship where each value of x is uniquely associated with a value of y.

This is a function: (1,1), (1,1), (2,1), (3,1)
each value of x has a unique value of y. If you see x = 1, you know y = 1.

This is not a function: (1,1), (1,2), (2,1), (3,1)
If you see x = 1, you don't know if y = 1 or y = 2. Not a unique association.

Answer 10

A.
(0,-45),(18,-45)
B.
(23,18),(23,-9)
C.
(8,48),(8,55)
D.
(-13,30),(-13,39)

Answer 11

all of those don't pass the test

Answer 12

once again, you are plotting one incorrectly

Answer 13

?

Answer 14

A

Answer 15

how?

Answer 16

does it just need to be the first plot number?

Answer 17

passes vertical line test

Answer 18

ohhhhhhhhh okk

Answer 19

i get it now

Answer 20

great!