Activity 2. Translate each in the form y = fox, where k is constant. 1. The distance (d) in kilometers travelled by a car varies directly as speed (s) in kilometer per hour. 2. The cost (c) of a dozen eggs varies directly as the price (p) of one. 3. The monthly expense (E) varies directly as the square of its sales (s). 4. The area of a rectangle (A) varies directly as its width (w). 5. The amount of VAT (V) varies directly as the number of items purchased (i).​