Comparing Proportional Relationships in Tables and Graphs

If the relationship in the table is proportional, write its equation.

• The relationship is not proportional

If the relationship in the table is proportional, write its equation.

• The relationship is not proportional

What is the constant of proportionality?

• $3

• $4

• $2

• $9

The constant of proportionality in the equation y = ½x is _______. 

• x

• y

• 1/2

• 2

Identify the constant of proportionality.

• 2x

• 2

• 4

• none (not proportional)

Does the following table represent a proportional relationship? If so identify the constant of proportional and create an equation to represent it.

• Proportional; k = 1/40 pages per day; y=1/40x

• Proportional; k = 40 pages per day; y=40x

• Not Proportional

• Proportional; k = 40 days per pages; y=40x

Does the following table represent a proportional relationship? If so, identify the constant of proportionality and create an equation to represent it.

• Proportional; k=8; y=8x

• Not Proportional

• Proportional; k = -8; y=-8x

• Proportional; k=1/8; y=1/8x

What makes a graph proportional?

• It is a straight line.

• It goes through the origin.

• It does not go through the origin.

• If it goes down instead of up.

Which of the following tables are proportional? (You may select more than one!)

• 
• 
• 

What is the unit rate for the table?

• $1 / 3 watermelon

• $3 / 1 watermelon

• 1/3 watermelon / pound

• $0.33 / 1 watermelon