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1-22.

Gerri made a function machine. Below are four pictures of her machine. (Note that these are all pictures of the same function machine.) Find the rule for Gerri’s function machine.

Function machine, input negative 1, rule labeled, Gerri's, output, negative 1. Function machine, input 3, rule labeled, Gerri's, output, 27. Function machine, input negative 2, rule labeled, Gerri's, output, negative 8. Function machine, input 0, rule labeled, Gerri's, output, 0.

Make a table.

Notice that this is not a linear function because the rate of change is different between each pair.

Look for a pattern between all of the points. (Take a guess and then check.)