And what I want to do in this video is see if we can identify whether the relationships are a direct relationship, whether they vary directly, or maybe they vary inversely, or maybe it is neither.

If you scale up x by a certain amount and y gets scaled up by the same amount, then it's direct variation. If you scale up x by some-- and you might want to try a couple different times-- and you scale down …

Sal explains what it means for quantities to vary directly or inversely, and gives many examples of both types of variation. Created by Sal Khan.

Probably the most obvious way, or the easiest way to do it in your head, was either just looking at what you have to multiply the numerator by and then doing the same thing to the denominator, or maybe …

Sal models a context about space travel with a direct variation equation.

Intro to direct & inverse variation Direct variation word problem: filling gas Recognizing direct & inverse variation: table Inverse variation word problem: string vibration

Practice Up next for you: Recognize direct & inverse variation Get 3 of 4 questions to level up!

This video talks about a sequence that alternates between positive and negative values. It shows how to find the limit of the sequence as n approaches infinity. If the limit exists, the sequence converges; if …

Now, depending on the situation it can be a lot of things. For instance, the number of soda cans you buy and the price you pay are in direct variation; here, k would be the price of one can. In terms of the …

Recognize direct & inverse variation Recognizing direct & inverse variation: table Direct variation word problem: filling gas Direct variation word problem: space travel Inverse variation word problem: string …