O custo mensal de um carro depende diretamente da kilometragem percorrida. Um motorista observou um gasto de R$380,00 para dirigir 480km em maio e um custo de R$460,00 para dirigir 800km no mês de junho.
a) Expressa o custo mensal C como uma função da kilometragem percorrida x, assumindo que uma relação linear descreve bem o problema.
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