Real math help.
How Do You Identify Direct Variation from a Table Using Ratios?
Note:
If you have a table of values and want to see if it represents a direct variation, just create ratios from the table. If all the ratios are the same, then you have a direct variation! This tutorial takes you through that process step-by-step.
Background Tutorials
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Ratio Definitions
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What's a Ratio?
Ratios are everywhere! The scale on a map or blueprint is a ratio. Ingredients sometimes need to be mixed using ratios such as the ratio of water to cement mix when making cement. Watch this tutorial to learn about ratios. Then think of some ratios you've encountered before!
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Direct Variation Definitions
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What's the Constant of Variation?
The constant of variation is the number that relates two variables that are directly proportional or inversely proportional to one another. But why is it called the constant of variation? This tutorial answers that question, so take a look!
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What's the Direct Variation or Direct Proportionality Formula?
Ever heard of two things being directly proportional? Well, a good example is speed and distance. The bigger your speed, the farther you'll go over a given time period. So as one variable goes up, the other goes up too, and that's the idea of direct proportionality. But you can express direct proportionality using equations, and that's an important thing to do in algebra. See how to do that in the tutorial!
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Further Exploration
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Direct Variation Definitions
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What Does Direct Variation Look Like on a Graph?
Want to know what a direct variation looks like graphically? Basically, it's a straight line that goes through the origin. To get a better picture, check out this tutorial!
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