On a road trip, the distance driven can be represented by the following equation y=15x where x is the number of gallons of gas what does the 15 represent

Answer 1

You are given

y = 15 * x

where y is the distance and x the number of gallons of gas to cover that distance. Consider the units:

y[miles] = 15[??] * x[gallons]

So the units of the parameter 15 must be [miles / gallon] to convert the gallons to miles.

15 therefore represents the miles / gallon for the vehicle.