Question

questiong in coments

Answer 1

3 ducks 1 pelican and 5 storks

Answer 2

http://www.mathwarehouse.com/algebra/relation/vertical-line-test.php <---- use the vertical line test

Answer 3

also, vertical lines themselves are not functions since they fail the vertical line test

Answer 4

Well, it's not B or C because it doesn't pass the vertical line test. (If you placed a vertical line on the graph, it shouldn't intersect two points) So that narrows things down for you.

Vertical lines aren't functions either.

So what does that leave you with?

Answer 5

if you plugged x = 3 into the "function" for choice A, what is the output? y = 0? y = 1? y = 2? You need to have exactly one output for any given input.

Answer 6

so it's D ?

Answer 7

Yes, it is.
But do you understand why D is the answer? (:

Answer 8

Yes , because no two points line up vertically

Answer 9

Good!
Anymore questions?