Answer
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Work Step by Step
A function is a relation between variables such that for one input variable value,
there is one and only one output variable value.
$ a.\qquad$
Working part time at a grocery store and getting paid by the hour (a fixed hourly rate in dollars).
This is a function, because if I work for x hours, there is no confusion about the amount I should be paid.
Only one amount (one output) is possible for a certain number of hours (an input) .
$b.$
If you know the amount on my pay check, determine the company I work for.
This is not a function because for one input (amount), there may be many companies (outputs) that would pay me the same amount.
