Khan Academy
Recognizing Direct and Inverse Variation
Sometimes, it is not always obvious which equations are direct variations and which are inverse variations. In this video, five different equations are considered. Each is manipulated and rewritten to determine whether there is a direct...
Khan Academy
Direct and Inverse Variation, Rational Expressions, Algebra II
In this overview video of direct and inverse variation, Sal shows the general form of each equation and its differences. The listener gains an intuitive understanding of the differences by highlighting how the x and y values vary with...
Curated OER
How Do You Write an Equation for Direct Variation Given a Point?
This problem may sound a bit confusing, but the teacher does a great job explaining what direct variation is. So watch this video and learn about k. It is a pretty direct explanation.
Curated OER
How Do You Find the Constant of Variation from a Direct Variation Equation?
What is a constant variation? How can something change and be constant? Oh, the rate of change is constant. So if there are two variables that are directly proportional they can have a constant of variation? Yes! Still a bit confused?...
Curated OER
How Do You Use the Formula for Direct Variation?
Use the formula for direct variation to solve for y, after finding the value of k. When you use the formula and determine the value of k and x, you can plug in those values to determine the value of y. A quick tutorial that takes you...
Curated OER
How Do You Write an Equation for Direct Variation from a Table?
y=kx. This is the direct variation equation. You have been given a table of values. So look at the table and figure out how to use this equation to write an equation that represents what is happening in the table. Does the equation...
Curated OER
What Does Direct Variation Look Like on a Graph?
In a graph of a direct variation, the line must pass through the origin, (0,0). See the teacher illustrate what that looks like on a graph.
Curated OER
What's the Direct Variation or Direct Proportionality Formula?
Direct variation? Constant of variation? Constant of proportionality? Two variables related? If one variable changes what happens to the other variable? What do all these terms have to do with each other? Watch this video as the...
Curated OER
What Does Direct Variation Look Like on a Graph?
In a graph of a direct variation, the line must pass through the origin, (0,0). See the teacher illustrate what that looks like on a graph.