More Lessons for Grade 9 Math
Videos, worksheets, games and activities to help Algebra and Grade 9 students learn about direct variation or direct proportion.
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.
Direct Variation Applications
Learn what it means for variables to vary directly.
Examples of direct variation
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You can use the free Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.