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TEEN DEFINITION: Quite simply, a function is just a rule which takes certain values as input values and a sign to each input value exactly one output value (you must be wondering what the "F" is in input or an output value? Well, they are just a fancy name for "variables").
The change in the input value is equalto the change in the output value.
The value that results from the substitution of a given input into an expression or function is the output. The value substituted into an expression or function is an input.
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The salary problem has 2 outputs for each input value.