Application problem with a linear function: Finding a coordinate given two points

The monthly cost (in dollars) of water use is a linear function of the amount of water used (in hundreds of cubic feet, HCF). The cost for using 13 HCF of water is  $38.05, and the cost for using 35 HCF is  $67.75. What is the cost for using 19 HCF of water?

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