End-of-year data for the number of Facebook users (in millions) from 2008 through 2011 are given in the following table. Year 2008 2009 2010 2011 Number, y 154.5 381.8 654.5 845.0 (a) Letting x = 0 denote the end of 2008, find an equation of the least-squares line for these data. y = (b) Use the result of part (a) to project the number of Facebook users at the end of 2016, assuming that the trend continues. (Round your answer to one de

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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.