Direct Variation - Concept

Concept Concept (1)

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 Sample Problems (5)

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Direct Variation - Problem 1

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.

Problem 1
How to write the equation that relates two variables that vary directly.
Direct Variation - Problem 3
Problem 3
Using direct variation to write relationships for word problems and use the equation to make predictions
Direct Variation - Problem 4
Problem 4
How to determine whether or not a relationship is direct variation or proportional
Direct Variation - Problem 5
Problem 5
Using direct variation to find the constant of variation and write a direct variation equation, and use the equation to make predictions