We often use the term direct variation to describe a form of dependence of one variable on another. An equation that makes a line and crosses the origin is a form of direct variation, where the magnitude of x increases or decreases directly as y increases or decreases. Direct variation and inverse variation are used often in science when modeling activity, such as speed or velocity.
Sample Problems (2)
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y varies directly as the cube of x.
A ball is dropped from the top of a building. The distance the ball falls is directly proportional to the square of the time it has been falling.