Question 243361
1) Net pay for an employee is the result of applying a linear equation.  For example, social security is about 8% of the adjusted gross pay. While health insurance might be $500.  So we would have:
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Net Pay = Gross Pay - .08*Gross Pay - 500
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2) A cell phone plan might be $30 per month plus 25 cents per text message.  So the monthly bill would be:
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cost = .25*number of messages + 30, which is the classic y = mx + b equation.