Question

Determine which relation is a function.

1. https://static.k12.com/calms_media/media/1348000_1348500/1348048/1/96da73175b781c9eb989ef01bdf190f6637ad48d/116023a.jpg

2. https://static.k12.com/calms_media/media/1348000_1348500/1348049/1/309ff705090582b2b57c95f6beb089d3035a4fae/116023b.jpg

3. https://static.k12.com/calms_media/media/1348000_1348500/1348050/1/d6d9c130e860bb1dd2185d723377fd1fb047c348/116023c.jpg

4. https://static.k12.com/calms_media/media/1346000_1346500/1346425/2/d0a99c48040788a7b607515dc740fc0892478721/116023d.jpg

Answer 1

@welshfella

Answer 2

is the answer d?

Answer 3

@smilie2015

Answer 4

apply the vertical line test.
If any vertical line cuts the graph more than once then its not a function. (its the duplicate x's again)

Answer 5

Do you still think it is d?

Answer 6

so c?

Answer 7

here there are no lines - any vertical line must not go through more than one point.

Answer 8

have a close look at c and d with the above in mind
One of those is a function.

Answer 9

so d?

Answer 10

the vertical line can , of course , be the y-axis.

Answer 11

Thank you so much for the help !!