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25 December, 06:21

Tom buys a new phone service. It's costs $20 to install, and then it costs 15 a month. Write an equation to show the cost of the phone (y) for any number of months (x).

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  1. 25 December, 08:38
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    The installation cost is fixed so treat it as a constant and treat the number of months as a variable and

    y = 20+15x
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