Atlanta and Cincinnati are 440 mi apart. John leaves Cincinnati, driving toward Atlanta a an average rate of 60 mph. Pat leaves Atlanta at the same time, driving toward Cincinnati
in her antique auto, averaging 28 mph. How long will it take them to meet?

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x

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