Question

Graph the relation in the table. Then use the vertical-line test. Is the relation a function?
x y
-2 3
-1 2
2 -1
4 -4

Answer 1

1-1 is a function, many to one is a function, many to many and one to many are not functions. Thus if there are 2 y's for one x you do not have a function, because it won't pass the vertical lines test.

Answer 2

Do you have a picture of the function?

Answer 3

yes

Answer 4

Link please.

Answer 5

If you run a vertical line (x=a) for it for all values of a, does it intersect more than once? In otherwords, if you take a ruler and vertically slide it across the function, is there any point in time that the ruler crosses the function more than once?
(The answer is no, so the graph *is* a function)