Function machine input → output — free printable diagram

About this illustration

This is a flat illustration depicting a function machine, illustrating the concept of input, function, and output. An arrow indicates an "input: 4" entering a central grey rectangular box labelled with the algebraic function "f(x) = 3x + 1". Another arrow shows "output: 13" exiting the box. This diagram teaches basic algebraic functions and how values are transformed, suitable for middle school mathematics curricula across various regions (e.g., US, UK, AU, NZ). It can be used in slides or worksheets to introduce function notation or for students to practice calculating outputs. The visual style is a flat, conceptual diagram with clear labels.

How to use

1. 1Right-click the image and choose “Save image as”, or use the download button.
2. 2Use it in your classroom worksheets, slides or printables — free under CC BY-NC 4.0.
3. 3Attribute as “Image by Kuraplan” or link back to kuraplan.com. Not for commercial resale.