The cost C, in dollars, of a prepaid cell phone call is proportional to the time t, in minutes, that the call lasts. The equation that represents this relationship for carrier A is C-0.15t. The table shows the relationship for carrier B. Which carrier has a lower unit rate? Time Cost (minutes) (dollars) 0.24 0.60 1.20 3.60 2 10 30

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A: Give data: The given expression for the price is P=3.75g+1.5. The given gallon of gas is g=12.

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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.