which of the following best defines an input?

a. an input is the result of a relation or the function rule, usually the y-values in a set of ordered pairs or on a table or graph.

b. an input is a special type of relation for which there is a rule that pairs each input with exactly one output.

c. an input is a set of ordered pairs in which no y-value repeats.

d. an input is the value that determines another based on the relation or the function rule, usually the x-values in a set of ordered pairs or on a table or graph.

D. An input is the value that determines another based on the relation or function rule, usually the x-values in a set of ordered pairs on a tale or graph.

Step-by-step explanation:

For any relation  (given ordered pairs), there are x - values and y-values, also called inputs and outputs.  For every input, there is an output.  For example, given the function rule:

y = 2x + 1

If x = 1, y = 3

If x = 2, y = 5

and, so on..

So, the output (y) is determined by the input (x) and is usually the x-values.  

huh? im pretty sure it is in 199

step-by-step explanation: