Question

Suppose you can drive a car m miles on g gallons of gasoline. The number of miles you can drive in your car is equal to 30 times the number of gallons of gasoline used. Which direct variation equation represents this situation?

Answer 1

I think your asking for an equation, and I hope I'm either right, or close to it.
m=30xg

Answer 2

m=30g

Explanation:

Suppose you can drive a car m miles on g gallons of gasoline. The number of miles you can drive in your car is equal to 30 times the number of gallons of gasoline used.

Number of miles varies directly with the number of gallons of gasoline used

m = k*g

The number of miles you can drive in your car is equal to 30 times the number of gallons of gasoline used.

So the equation becomes m= 30 *g

m=30g