Function Machines

A function machine takes an input and changes it into an output

Example: A machine adds $3$

If the input is $4$, the output will be $7$

Some function machines have two operations

• Example: A machine multiplies by $2$, then adds $5$

If the input is $3$, the output will be $11$

The input can be a variable

The machine will complete the operation the same way

• Example: if the input is $x$ and the machine adds $4$, the output will be $x + 4$