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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If y varies directly with x and the value of y is 22 when the value of x is 2, find y when x = 5.
A biker's distance traveled on flat terrain varies directly with its traveling time. If the biker has gone 90 miles after 2½ hours, how long will it take him to go 306 miles?