International Calling A cell phone company offers aninternational plan by charging $30 for the first 80 minutes, plus$0.50 for each minute over 80.(a) Write a linear model that relates the cost C, in dollars, oftalking x minutes, assuming x Ú 80.(b) What is the cost of talking 105 minutes? 120 minutes?

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.