INSTRUCTORS Carleen Eaton Grant Fraser Eric Smith

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### Direct Variation

• A direct variation is given by an equation of the form y = kx, where k is a nonzero constant, called the constant of variation.

• The graph of a direct variation is a straight line with slope k and passing through the origin.

• You can solve problems involving direct variation when you are given values satisfied by the direct variation and asked to find a missing value. First, use the given values to find k. Then use k to find the unknown value.

### Direct Variation

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Definitions 0:13
• Direct Variation
• Constant of Variation
• Graph 1:02
• Example: Positive and Negative k
• Applications 1:49
• Lecture Example 1 2:16
• Lecture Example 2 4:39