A telephone company makes up it's monthly bills as follows:a fixed charge of 800 naira plus a charge proportional to the number of units of call on the telephone.if it charges 2 naira per unit of call,calculate the total charge on
(a)80 units

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  1. well, it is clear that y = 800 + 2x
    so plug in the various values for x

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  2. Good

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