what is the linear equation of $40 a month phone plan, and 20 cents per text messeage?

We have a system of linear equations project, we have to choose between two real life situations and then using system of lineat equations to decide what to buy.
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what is the linear equation of $40 a month phone plan, and 20 cents per text messeage?
We have a system of linear equations project, we have to choose between two real life situations and then using system of lineat equations to decide what to buy.

P = 0.20t + 40
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