Type of Variation Statements/Phrases 1. The volume of a pyramid varies jointly as the area of the base and the altitude. 2. The amount of water to the space that water did not occupy in a particular container 3. The age of a used car to its resale value 4. The time spent in walking to the rate at which a person walks 5. The acceleration of an object varies directly as the force exerted and inversely as its mass. 6. The appropriate length of a rectangular beam varies jointly as its width and its depth. 7. The area of the wall to the amount of paint used​