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.
If each input value leads to only one output value, classify the relationship as a function. If any input value leads to two or more outputs do not classify the relationship as a function.
