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 Variation 1
This video solves a basic direct variation problem: the cost of buying gas for your car varies directly with the number of gallons you need to purchase. Sal shows how to write a direct variation equation based on this problem and solves...
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...
Flipped Math
Calculus AB/BC - Modeling Situations with Differential Equations
Differentiate between models. Pupils watch as the video works through three examples of creating a differential equation to model a situation. Scholars use their knowledge of proportional relationships to set up the equations and to...
Mathispower4u
Hooke's Law - Direction Variation Application
Get a direct stretch from a spring. The presentation shows how Hooke's law uses direct variation. Scholars see how to calculate the spring constant for a spring given a stretch distance and a force. Individuals then use the spring...
Mathispower4u
Direct Variation Equation (Example)
Directly, find a missing value. The video demonstrates how to find the fourth value in a direct variation relationship knowing three others. Scholars learn to find the constant of variation and use it to find a missing value.
Mathispower4u
Graph a Direct Variation Equation (Negative Slope) Example 2
Bypass the table and go straight to the graph. A short video shows one example of graphing a direct variation equation with a negative slope by using the same method as graphing an equation in slope-intercept form. Pupils see it's easy...
Mathispower4u
Direct Variation (Distance = Rate x Time) Example
Speed through a direct variation example. The presented problem uses a distance-rate-time problem as an example of a direct variation problem. Using the slope between two points of time and distance, the video shows learners how to...
Mathispower4u
Direct Variation Applications
What would I weigh there? A video uses the relationship of the weight of an astronaut on Earth and the moon to create a direction variation equation. Using the created equation, pupils find the weight of any astronaut on the moon.
Mathispower4u
Graph a Direct Variation Equation (Positive Slope) Example 1
Show classes a quick method to graphing. A short video demonstrates how to graph a direct variation equation by comparing it to graphing an equation in slope-intercept form. By seeing the y-intercept is 0, scholars easily plot the slope...
Corbett Maths
Inverse Proportion
Take an indirect view of proportionality. Using a similar approach of direct variation, the resource shows how to solve inverse proportions. The video steps through finding the constant of proportionality to write the formula for the...
Corbett Maths
Direct Proportion
Direct change by finding the constant. Using two known values within a direct proportion, the resource shows how to find the constant of proportionality. Once individuals do that, they then find any value given the other. The video works...
Anywhere Math
Direct Variation
You'll want to use the video directly, without waiting. Pupils learn how to identify whether a given relationship represents a direct variation by watching an engaging, informative video. They see how tables, graphs, and equations relate...
Krista King Math
Inverse Variation
Apply rational functions to a problem-solving situation through inverse variation. The video tutorial explains the concept of inverse variation and introduces learners to the formula. The instructor explains how to solve problems that...
Krista King Math
Direct Variation
Viewers examine the properties of direct variation equations and use them to problem solve. The instructor describes the concept of direct variation and then applies the formula to a word problem. She shows the relationship between the...
statisticsfun
How to Calculate Standard Deviation and Variance
What if math teachers are really pirates and they want us to find x so they can get the buried treasure? A short video explains how to calculate standard deviation and variance with a step-by-step guided practice problem. The...
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.
statisticsfun
Why are Degrees of Freedom (n-1) Used in Variance and Standard Deviation
Don't be mean, be above average. A straightforward video explains why degrees of freedom are used and how to recognize the error based on your sample population.