The input to Function Machine 1 is x. Write down an expression for the output.

If the output is 7 what was the input?

In Function 2, a is constant. If the input is 4 what is the output?

The functions from Function Machines 1 & 2 are combined to give Function Machine 3 where the output of Function Machine 2 is used as the input for Function Machine 1.

The number 2 is put into Function Machine 3 and the output is 3. Find a.

Make up some questions of your own using these function machines.

Click here to download the FUNCTION FLOW worksheet.

Click here to download the Notes for Teachers.



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