If Y Varies Directly as X, Find the Direct Variation

Multiple Choice

If y varies directly as x, find the direct variation equation for the situation.
-The amount of gas that a helicopter uses is directly proportional to the number of hours spent flying. The helicopter flies for 2 hours and uses 12 gallons of fuel. Find the number of gallons of fuel that the helicopter uses
To fly for 5 hours.

A) 30 gallons
B) 10 gallons
C) 36 gallons
D) 35 gallons