Direct Variation Equation

​Direct and Inverse Variation

Open Ended

What is the difference between direct and inverse to you?

​As the first unit goes UP the second unit goes UP

​OR

​As the first unit goes DOWN the second unit goes Down

Multiple Choice

What is the equation for direct variation?

• y = kx where k=0

• y = kx where k≠0

• k = yx where k≠0

• x = ky where k≠0

​As the first unit goes UP the second unit goes DOWN

​OR

​As the first unit goes DOWN the second unit goes UP

Multiple Select

What are the equations for inverse variation? Choose 2.

• y = kx

• y = k/x

• k = xy

• y = x/k

Multiple Choice

What type of variation does this scenario represent?
You and some friends decide to buy 2 pizzas and split the cost evenly.
The number of friends who are sharing the cost of the pizzas
and the amount of money you pay for your share.

• direct variation

• inverse variation

Multiple Choice

What type of variation does this scenario represent?
The outside temperature
and the number of layers of clothes you need to wear outside to feel comfortable 

• direct variation

• inverse variation

Multiple Choice

What type of variation does this scenario represent?
The length of time you charge your cell phone
and the battery power 

• direct variation

• inverse variation

Multiple Choice

What type of variation does this scenario represent?
The less you eat junk food
and the affect on your weight.

• direct variation

• inverse variation

Direct variation: y=kx
As one variable increase/decrease, the other variable increase/decrease.

Inverse variation: y=k/x
As one variable increase/decrease, the other variable decrease/increase.

​

Use the link below to better understand the difference between direct and inverse variation.

https://youtu.be/92U67CUy9Gc