Variation Functions

​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

Fill in the Blanks

As the first unit increases (goes up) the second unit

.

​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

Fill in the Blanks

As the first unit decreases (goes down) the second unit

(goes up).

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