Answer:
a function is like f(X)=2x+6 where X can be anything , you just substitute in the number u have been given
Explanation:
other examples could include
f(X)=X+1
or they can start with
g(X)=3x+7
h(X)=4-3x
and there are inverse functions witch can be found be rearranging the function
example if substituteing a function
if
f(X)= 2x+1
f(3)=2(3)+1
f(3)=6+1=7
Hope this helps