What is a Function

A function is usually represented by the letter f. In a equation it is usually written like f(x) (meaning f of x). This f(x) simply represents why in an equation. For example you can rewrite f(x)=3x-5 as y=3x-5. To use functions in equations, take whatever's in the x spot and replace it with the x's in the equation. For example for f(2)=3x-5 replace the x with a 2 like 3(2)-5 and the final answer is 1. You can also use functions in domains and intercepts. Here is another example of a function problem.