Proportion/Slope Review

Which graph is proportional?

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• 
• 
• 

Answer explanation

In order for a graph to represent a proportional relationship, it has to ...

1. 1. form a straight line,

2. 2. pass through the origin.

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.

Answer explanation

In order for a graph to represent a proportional relationship, it has to ...

1. 1. form a straight line,

2. 2. pass through the origin.

The graph below shows the number of rabbits in a population over a number of years. Is the number of rabbits proportional to the number of years? Explain.

• Yes, because the line is straight.

• No, because the line isn't straight.

• No, because the line is straight.

• Yes, because the line isn't straight.

Answer explanation

In order for a graph to represent a proportional relationship, it has to ...

1. 1. form a straight line,

2. 2. pass through the origin.

This graph does not form a straight line and it does not pass through the origin, so it is not proportional.

Tags

CCSS.HSS.ID.A.1

CCSS.HSS.ID.B.6

How do you find k? 

Which statement best describes the relationship between x and y in the table?

• Proportional
• Not Proportional

Proportional or Non-Proportional?

• Proportional

• Non-Proportional

What is the constant of proportionality (in miles per hour) based on the table?

• 45
• 90
• 135
• 2

The cost of 4 pounds of grapes is $24.36. What is the constant of proportionality the relates cost in dollars, y, to the number of pounds of grapes, x?

• 6.09
• 20.36
• 8.12
• 28.36

What is the unit rate in this proportional relationship?

• 60 miles per hour

• 120 miles in 2 hours

• 1 mile per hour

Answer explanation

The unit rate represents how many miles can be traveled in 1 hour. By looking at the graph, you can see that 60 miles is at the 1 hour mark.