You purchase a very basic cell phone plan that charges $24.99 a month. This plan allows for data usage but that will cost you $5 for every GB you use in a month. Write an equation below in slope-intercept form that models this situation.

The slope-intercept is the most “popular” form of a straight line. Many students find this useful because of its simplicity. One can easily describe the characteristics of the straight line even without seeing its graph because the slope and y-intercept can easily be identified or read off from this form.

The linear equation written in the form

y = mx + b

is in slope-intercept form where: m is the slope, and b is the y-intercept.

In the given question the slope of the equation is 5 as $5 is charged for every GB used while $24.99 would be the intercept.

Thus the equation of this given condition in the intercept form would be

y = 5x + 24.99

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