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Linear Equations in the real world

They're in our lives every day: cell phone plans!

Linear Equations:Slope Intercept Form | slope of a line | y-intercept
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Cell Phone Company A's calling plan is represented by the line on the left. How much does Company Charge for 20 minutes of usage?

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How much does cell phone company B charge for thirty minutes of usage?

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$6 will buy how many minutes on company C's cell phone plan?

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How to solve Absolute Value Equations

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