Introduction to Proportional Graphs

Introduction to Proportional Graphs

We can determine if graphs are proportional or not proportional.

Let's Review

Proportional Equations

We use the form y=kx to write a proportional line

• y=15x has a constant of 15

• y=30x has a constant of 30

• y=0.5x has a constant of 0.5

• 
  

We use the form y=kx to write a proportional line

• y=30x+2 is NOT proportional

• y=30x is proportional

• y=0.5x is proportional

• y=0.5/x is not proportional

Multiple Choice

y=30x

• proportional

• NOT proportional

Multiple Choice

y= x +5

• proportional

• NOT proportional

Multiple Choice

y= 30x +5

• proportional

• NOT proportional

Multiple Choice

y= 0.25x

• proportional

• NOT proportional

Proportional Graphs MUST

• pass through the origin (0,0)

• be a straight line

This graph is NOT proportional

• It does not pass through the origin (0,0)

This graph is NOT proportional

• It is not a straight line

Multiple Choice

Proportional or not proportional?

• Propotional

• NOT proportional

Multiple Choice

Proportional or not proportional?

• Propotional

• NOT proportional

Multiple Choice

Proportional or not proportional?

• Propotional

• NOT proportional

Multiple Choice

Proportional or not proportional?

• Propotional

• NOT proportional

Multiple Choice

Proportional or not proportional?

• Propotional

• NOT proportional

Multiple Choice

Proportional or not proportional?

• Propotional

• NOT proportional

Multiple Choice

Proportional or not proportional?

• Propotional

• NOT proportional

Final Review: Proportional Graphs MUST

• pass through the origin (0,0)

• be a straight line

Multiple Choice

Quiz Question 1: Which graph represents a proportional relationship?

• A

• B

• C

• D

Multiple Choice

Quiz Question 2: Which graph represents a proportional relationship?

• A

• B

• C

• D

Great Work Today!