6) * 10 poin A cell phone data plan has a monthly charge of $30 and charges $15 for each additional 10 gigabytes of data. The function below can be used to determine the cost of the cell phone plan for any month. What are the rate of change and initial value? y = 15x + 30 A. The initial plan cost is the y-intercept of 30 and the rate of change is $15 for each additional 10 gigabytes. B. The initial plan cost is the y-intercept of 10 and the rate of change is $15 for each additional 10 gigabytes. C. The initial plan cost is the y-intercept of 10 and the rate of change is $30 for each additional 10 gigabytes. D. The initial plan cost is the y-intercept of 15 and the rate of change is $30 for each additional 10 gigabytes.

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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.