Question

write a function rule for the problem​

Answer 1

A relation from a set X to a set Y is called a function if each element of X is related to exactly one element in Y. That is, given an element x in X, there is only one element in Y that x is related to. ... This is a function since each element from X is related to only one element in Y.

Answer 2

• A function is one which relates the input to the output.
• A function take the elements from a set (domain) and relates it to the elements in the another set(co-domain).
• A function rule is the relationship between the dependent and the independent variable in the form of an equation.

• It explains how to determine the value dependent variable say X, and the value of the independent variable say Y.

For example,

       X      f(x)

        2      14

      f(x)=6x+2

      sum number times(x)+sum other numbers