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Javier and Ellema both get their cars washed and fill their gas
tanks at the same gas station. Javier pays $26.96 for a car wash
and 5.6 gallons of gas. Ellema pays $48.62 for a car wash and
13.2 gallons of gas.
What is an equation for the cost of gas and a car wash as a
function of the amount of gas bought?