Proportional relationships Review

Coffee costs $2 per pound. How much will 13 pounds of coffee cost? 

• $13
• $15
• $24
• $26

What is the constant of proportionality for this table? 

• k = 0
• y = 25x
• k = 25
• x = 25y

Proportional?

• Yes

• No

Proportional?

• Yes

• No

Does this table represent a proportional relationship?

• Yes
• No

You travel 150 miles on 5 gallons. How far did you travel per gallon?

• 15 miles
• 30 miles
• 3 miles
• 25 miles

Write an equation that represents this graph?

• y = 15x

• y = 18x

• y = 54x

• y = 72x

Identify the constant of proportionality.

• k = 25

• k = 50

• k = 100

• k = 1/50

• none (not proportional)

Identify the constant of proportionality.

• k = 5

• k = 1/5

• k = 1

• k = 2.5

• none (not proportional)

Select all of the graphs that do NOT represent a proportional relationship.

• 
• 
• 
• 
• 

Answer explanation

Proportional graphs form a straight diagonal line that crosses the origin (0, 0).

If the points are not connected, imagine connecting them and seeing if the graph fits the criteria above.