LINEAR EQUATIONS

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How to write equations and draw graphs for the following situations?

Are any free calls/ free messages/ data included?
Do call rates change after a certain level of usage? For example, for the first 100 minutes, call rates are 50 paise/ min, but for the period exceeding 100 minutes, the charges become 30 paise/min.
Are there different rates for mobile to mobile calling and mobile to landline calls?
Is there a plan with unlimited calling?

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