Question

plz help
http://prntscr.com/9pov0y

Answer 1

Any ideas?
:-)

Answer 2

Do you know what a "correspondence" means?

Answer 3

A function is defined as a correspondence between two sets,

the domain and the range,

which in your question are

the set of x-values for the domain

and

the set of y-values for the range.

Answer 4

Do you know what a function is?
How many y values can x = ?

Answer 5

A function is a special type of correspondence between these two sets,

that assigns to each member of the domain

EXACTLY one member of the range.

That means for each and every x-value there must be one and only one y-value

Answer 6

In other words, no x-value can be assigned to two or more y-values.

Now, look at option D and ask yourself is any x-value assigned to two or more y-values?

If the answer is yes, then it is not a function;

if the answer is no, then it is a function.

Answer 7

Note,

each member of the range

must be assigned to

at least one

member of the domain.

Which means a y-value can have more than one x-value assigned to it,

but it must have at least one.