A monthly cell phone charge is $45. Each long-distance minute used costs $0.30. The total monthly charge for Sarah’s cell phone bill is $60. Her monthly cell phone cost is represented by the function f(x)=45+0.30xfx=45+0.30x where xx represents the number of long-distance minutes used. If Sarah’s cell phone bill is $60, how many long-distance minutes did she use?
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.
A monthly cell phone charge is $45. Each long-distance minute used costs $0.30. The total monthly charge for Sarah’s cell phone bill is $60. Her monthly cell phone cost is represented by the function f(x)=45+0.30xfx=45+0.30x where xx represents the number of long-distance minutes used. If Sarah’s cell phone bill is $60, how many long-distance minutes did she use?
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