# Grades 9 to 12 Function Flow

*By toni On 1 July, 2018 · Leave a Comment*

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 for the Notes for Teachers.

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