Name: What Is a Function?
Uploaded: 2023-07-26T06:54:19.424Z
Channel: House of Math
Description: The definition of a function is that for each input value, often x, there can be only one output value, often y. Learn more by watching this video.

In computer programming, you will encounter a type of code known as a function. However, functions in programming are different from functions in math. In programming, functions can give a single output value, but they could also give several outputs or none at all. It's possible to use functions in programming to work on mathematical functions!

The definition of a function is that for each input value, often x, there can be only one output value, often y. Learn more by watching this video.

A function is a relationship between two — or more — variables. If you input a number into a function, it can only output one value.

The input variable of a function, often named x

The output variable of a function, often named y

. By plotting these in a coordinate system you can visualize the relationship between the input, 

, of the function. This is what we mean by drawing a graph.

A function table provides an overview of a function’s input values, and its associated output values.

Every point in the coordinate system has coordinates of the form 

. The first coordinate tells you where the point is along the 

-axis, and the second coordinate tells you where the point is placed along the 

The horizontal axis in a coordinate system

The vertical axis in a coordinate system. Often called 

A symbol, often a letter from the alphabet, which represents an unknown value.